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Добірка наукової літератури з теми "Anodic oxide coatings"

Автор: Grafiati

Опубліковано: 30 травня 2022

Оновлено: 31 травня 2022

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Статті в журналах з теми "Anodic oxide coatings"

Chiba, Makoto, Chinami Yamada, Haruka Okuyama, Minori Sugiura, Sven Pletincx, Hilke Verbruggen, Atsushi Hyono, Iris De Graeve, Herman Terryn, and Hideaki Takahashi. "Development of novel surface treatments for corrosion protection of aluminum: self-repairing coatings." Corrosion Reviews 36, no. 1 (February 23, 2018): 55–64. http://dx.doi.org/10.1515/corrrev-2017-0056.

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AbstractTwo types of self-repairing coatings for the protection of Al and its alloys are reviewed: (1) organic coatings with capsules containing repairing agent and (2) porous anodic oxide films with inhibitor solution stored in the pores of the oxide film. First, polyurethane microcapsules containing liquid surface-repairing agents were synthesized and polyurethane coating with the capsules was painted on Al alloy specimens. After mechanical damage to the coating, self-repairing occurred by the reaction of water vapor in the air with the repairing agents released from the capsules. Second, porous-type anodic oxide films were formed on Al alloys, and the pores of the anodic oxide films were filled with inhibitor solutions, followed by application of a covering polyurethane layer. Inhibitors released from the pores efficiently protected the Al alloy substrate from corrosion arising from induced mechanical damage.

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Konno, Yoshiki, Etsushi Tsuji, Yoshitaka Aoki, Toshiaki Ohtsuka, and Hiroki Habazaki. "Corrosion protection of iron using porous anodic oxide/conducting polymer composite coatings." Faraday Discussions 180 (2015): 479–93. http://dx.doi.org/10.1039/c4fd00232f.

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Conducting polymers (CPs), including polypyrrole, have attracted attention for their potential in the protection of metals against corrosion; however, CP coatings have the limitation of poor adhesion to metal substrates. In this study, a composite coating, comprising a self-organized porous anodic oxide layer and a polypyrrole layer, has been developed on iron. Because of electropolymerization in the pores of the anodic oxide layer, the composite coating showed improved adhesion to the substrate along with prolonged corrosion protection in a NaCl aqueous corrosive environment. The anodic oxide layers are formed in a fluoride-containing organic electrolyte and contain a large amount of fluoride species. The removal of these fluoride species from the oxide layer and the metal/oxide interface region is crucial for improving the corrosion protection.

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Liu, Yu Wei, Wei Zheng Zhang, and Yuan Fu Cao. "Thermal Analysis of an Anodic Oxide Coating Diesel Engine Piston Using 3-D Finite Element Method." Advanced Materials Research 548 (July 2012): 450–55. http://dx.doi.org/10.4028/www.scientific.net/amr.548.450.

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According to the phenomenon that the piston’s reliability and durability have been significantly weakened due to its high temperature, hard anodizing is used to hinder the heat transfer from the combustion gas to the metal base of the piston. Thermal analyses are performed on pistons with different thicknesses of anodic oxide coatings. The effects of coatings on the thermal behaviors of the pistons are investigated. The numerical results are compared with each other. It has been shown that the maximum surface temperature of the coated pistons with anodic oxide coating which has low thermal conductivity are significantly improved. Also, considering the hard anodizing process, the 100 ~ 150μm thickness of the anodic oxide coating would meet the requirements of the piston’s reliability.

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Вayrachniy, B. I., and I. A. Tokareva. "Nanostructured Anodic Oxide Films of Niobium: Features of Electrochemical Formation, Functional Properties and Applications (Review)." Фізика і хімія твердого тіла 17, no. 2 (June 15, 2016): 160–69. http://dx.doi.org/10.15330/pcss.17.2.160-169.

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The review summarizes data on the anodic behavior of niobium in aqueous solutions. Features of electrochemical formation nanostructured oxide coatings on niobium by anodic oxidation are systematized. The article deals with theoretical aspects formation of the porous anodic oxide layers. The influence of process parameters and the characteristics of the electrolyte on layer of niobium oxide were analyzed. The functional properties of porous coating on niobium are considered and promising areas of practical application identified.

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Wen, Yu Qing, Hui Min Meng, Wei Shang, and Xiu Juan Jiang. "Electrochemical Characteristics of the Rare Earth Compound Coating on 6061 Aluminum Alloy." Applied Mechanics and Materials 71-78 (July 2011): 2361–65. http://dx.doi.org/10.4028/www.scientific.net/amm.71-78.2361.

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The composite coatings were prepared on aluminum alloy by anodizing and chemical conversion method. The coatings consisted of a anodic oxide coating and a rare earth conversion coating. The surface morphology and composition of the composite coatings were analyzed by scanning electron microscopy (SEM) and energy dispersive X-rays (EDX). The electrochemical properties of the different samples were researched by Potentiodynamic polarisation and electrochemical impedance spectroscopy in a 3.5-wt.% NaCl solution. The results showed that corrosion current density of the sample with composite coatings was 3.611×10-9 A·cm-2, impedance was 6.107×105 Ω·cm-2. The composite coatings had better corrosion resistance than the sample with anodic oxide film and the aluminum alloy substrate.

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Yamamoto, Dai, Kensuke Kuroda, Ryoichi Ichino, and Masazumi Okido. "Anodic Oxide Coatings on Ti Alloys and their Osteoconductivity." Materials Science Forum 706-709 (January 2012): 612–16. http://dx.doi.org/10.4028/www.scientific.net/msf.706-709.612.

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Titanium and Ti alloys are widely used as substitutional materials for natural bone because of their good biocompatibility, high strength, and high corrosion resistance. In our previous studies, TiO2 coating on Ti with Ra (arithmetical means of roughness) < 0.1 μm formed by anodizing had much higher osteoconductivity than that of pure Ti. It can be expected that TiO2 coating with fine surface can improve the osteoconductivity of Ti alloys. In this study, the effects on the osteoconductivity of TiO2 coatings on different kinds of Ti alloys were investigated by in vivo study. TiO2 coatings with Ra < 0.1 μm were formed on 4 kinds of Ti alloys (Ti-6Al-4V (Ti64), Ti-6Al-7Nb (Ti67), Ti-29Nb-13Ta-4.6Zr (TNTZ), Ti-13Cr-1Fe-3Al (TCFA)) using anodizing in H3PO4 aqueous solution. Surface properties of these coatings were evaluated using SEM, XRD, and XPS. In in vivo study, samples were implanted in rats’ tibia for 14 days, and then removed. Cross section of the sample was observed with optical microscope and bone-implant contact ratio (RB-I) at the interface between body tissue and bone was used as a parameter of osteoconductivity. Anatase type TiO2 coatings with Ra < 0.1 μm were uniformly formed on all of the Ti alloys by anodizing at low voltage. These oxide coatings contained the ions of other alloy elements. TiO2 coatings on Ti64 and Ti67 indicated high osteoconductivity similar to that of TiO2 coating on pure Ti. On the contrary, TiO2 coating on TNTZ and TCFA showed low osteoconductivity. It was thought that ions of alloy elements brought bad influence on the osteoconductivity of TiO2.

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Chilimoniuk, Paulina, Robert P. Socha, and Tomasz Czujko. "Nanoporous Anodic Aluminum-Iron Oxide with a Tunable Band Gap Formed on the FeAl3 Intermetallic Phase." Materials 13, no. 16 (August 6, 2020): 3471. http://dx.doi.org/10.3390/ma13163471.

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Nanostructured anodic oxide layers on an FeAl3 intermetallic alloy was prepared by two-step anodization in 20 wt.% H2SO4 at 0 °C. The obtained anodic oxide coating was subjected to phase and chemical composition analysis using XPS and XRD techniques. An analysis of the band gap of individual coatings was also performed. The applied parameters of the anodization process were determined, enabling the formation of a nanostructured coating on the FeAl3 intermetallic alloy. Tests were carried out on samples produced at a voltage between 10 V and 22.5 V in 2.5 V steps. The produced coatings were subjected to an annealing process at 900 °C for 2 h in an argon protective atmosphere. Moreover, the influence of the substrate chemical composition on the chemical and phase composition of the anodic oxide are discussed. Band gaps of 2.37 eV at 22.5 V and 2.64 eV at 10 V were obtained directly after the anodizing process. After applying the heat treatment, band gap values of 2.10 eV at 22.5 Vand 2.48 eV for the coating produced at 10 V were obtained.

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Yu, Mei, Wu Jiang, Jian Hua Liu, and Song Mei Li. "Black Anodized Thermal Control Coating on LY12 Aluminum Alloy." Advanced Materials Research 233-235 (May 2011): 2166–71. http://dx.doi.org/10.4028/www.scientific.net/amr.233-235.2166.

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The black thermal control coatings were prepared by etching anodic oxide film and coloring with an organic ATT dyestuff on the LY12 aluminum alloy. The anodic oxide film on aluminum alloy was formulated in 20% aqueous solution of sulfuric acid in galvanostatic conditions. The microstructure of the anodized coating was studied by scanning electronic microscope (SEM). Open circuit potential (OCP) was applied to study the etching of porous oxide layers in the immerging acid solution. The influence of coloring on the optical properties of the coating was investigated. Results showed that the solar absorptance and infrared emittance increased by increasing coloring times.

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Grote, Fabian, Huaping Zhao, and Yong Lei. "Self-supported carbon coated TiN nanotube arrays: innovative carbon coating leads to an improved cycling ability for supercapacitor applications." Journal of Materials Chemistry A 3, no. 7 (2015): 3465–70. http://dx.doi.org/10.1039/c4ta05905k.

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Innovative carbon coating on nano-porous anodic aluminum oxide templates enables coatings on dense self-supported nanostructured arrays in a reverse manner for applications in energy devices (e.g., supercapacitors).

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da Forno, Anna, Massimiliano Bestetti, Nora Lecis, Stefano Paolo Trasatti, and Monica Trueba. "Anodic Oxidation and Silane Treatment for Corrosion Protection of AM60B Magnesium Alloy." Materials Science Forum 690 (June 2011): 413–16. http://dx.doi.org/10.4028/www.scientific.net/msf.690.413.

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Oxide films have been produced on AM60B magnesium alloy using micro-arc oxidation process in an environmentally friendly alkaline solution with and without addition of different oxides nanoparticles (TiO2, ZrO2 and Al2O3). In order to seal the oxides porosity generated in the sparking process, a silane-based top coat has been applied. The surface morphology of samples was analyzed by Scanning Electron Microscopy (SEM). Scratch tests were performed for evaluating the adhesion strength of the anodic oxides. The corrosion resistance of the oxide- silane- based topcoat composite coatings was evaluated in 3.5% NaCl solution using anodic polarization tests. The anodizing in oxides nanoparticles rich solutions (ZrO2 or Al2O3), followed by a silane top coat treatment performed using OSi as precursor, is an interesting way to synthesize adherent corrosion resistant coatings on magnesium alloy AM60B.

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Дисертації з теми "Anodic oxide coatings"

Smith, Marilyn. "The colouring, sealing and abrasion resistance of anodic oxide coatings." Thesis, London Metropolitan University, 1990. http://repository.londonmet.ac.uk/2981/.

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The service performance of anodised aluminium in architecture is dependent upon the control of the anodising, colouring and sealing processes. The quality of the anodic oxide film is determined by assessment tests. The use of a nitric acid ‘predip’ on soft films was shown to dissolve a soft outerlayer. A new admittance test was devised in which the ‘drift’, Y, was measured using 33%, nitric acid. This test threw light on the sealing quality of films exposed to the environment and those sealed in nickel salt solutions. Well-sealed, hard films gave a Y value of 0.1 to 0.2. A sealing mechanism for nickel acetate solutions is proposed in which ageing of a Ni-A1 complex is thought to play a significant role. The admittance-abrasion (Y-?) profile was used to supplement other test data. An accelated sulphur dioxide test was investigated, the optimum conditions for which were 40°C for 6 hours. The presence of a sealing bloom was determined by a simple go/no go three paper abrasion test. The assumption is made that Yt (25°C ) = a + bt and linear regression has been used to find b. It has been found that for batches having a range of thicknesses but a common sealing time, the linear relation is a reasonable assumption when the gradient is < +10. The admittance values of electrocoloured tin black film s have been found to be anomalous. The gradients are negative due to the presence of tin in the pores. Linear regression has been used to obtain an average value of b over the whole thickness range, which gives information as to the degree of sealing. Colouring and soaking in sulphuric acid at elevated temperatures (before sealing) reduces the abrasion resistance. The abrasive wheel test was also used to show the depth of tin within the pores. The use of the addition agent ‘Tribrite’ in tin colouring solutions suppresses the outward, whiskery growth of tin in the pores.

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Tiwari, Rajesh Kumar. "The Thermal Stability of Anodic Oxide Coatings - Strength and Durability of Adhesively Bonded Ti-6Al-4V Alloy." Diss., Virginia Tech, 2002. http://hdl.handle.net/10919/28528.

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The lap shear strength of chromic acid anodized, primed, Ti-6Al-4V alloy bonded with a high performance FM-5 polyimide adhesive has been investigated as a function of thermal treatment for selected times at various temperatures in air. The research findings indicate that the lap shear strength decreases with the increase in duration of the thermal treatment at constant temperature and with the increase in temperature at constant time. The bond fails increasingly in the oxide coating with increasing treatment temperature and time of treatment. Surface analysis results for debonded specimens suggest that the process leading to failure is the formation of fluorine-containing materials within the oxide, which weakens the adherend-adhesive bond. The formation of the fluorine components is facilitated by treatment at elevated temperatures. This study suggests that the presence of fluoride ions in the anodic oxide coating, prior to bonding, is detrimental to the bond strength of adhesively bonded Ti-alloy when exposed to high temperatures. The wedge test configuration was used to investigate the influence of temperature on the bond durability of adhesively bonded chromic acid anodized Ti-6Al-4V alloy in air. Based on the average crack length vs. exposure time data, the bond durability varied in the order -25Â°C > 24Â°C > 177Â°C. In each case, the bonded joint failed cohesively within the adhesive, irrespective of the temperature of exposure. XPS analysis and scanning electron photomicrographs of failure surfaces revealed that the failure occurred at the scrim cloth/adhesive interface. The influence of thermal treatment history on the bond durability of adhesively bonded chromic acid anodized Ti-6Al-4V alloy immersed in boiling water was also investigated. The average crack length vs. immersion time indicated no significant differences for specimens that were thermally treated and then bonded compared to the non-thermally treated specimens. In addition, the failure mode was cohesive within the adhesive for specimens prepared using various thermal treatment conditions. The crack growths for samples treated for 0.5 hour and 1.0 hour and for non-thermally treated specimens for any given exposure time were equivalent. In addition, cohesive failure (failure within adhesive) was observed for each specimen under each treatment condition. The specimens that were bonded and then thermally treated for 3 hours, failed in the oxide coating immediately upon insertion of the wedge. Surface analysis results for debonded specimens suggest that the process leading to failure is the formation of fluorine-containing materials within the oxide. The measured average activation energy for the formation of aluminum fluoride species is 149 kJ/mol. The high activation energy suggests that the rate of aluminum fluoride formation is substantial only at high temperatures. In summary, the presence of fluorides in the anodic oxide coatings prior to bonding is detrimental to the overall strength and durability of adhesively bonded chromic acid anodized Ti-6Al-4V joints which have been exposed to high temperatures (350Â°C-399Â°C).
Ph. D.

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Смирнова, Олександра Юріївна. "Удосконалення технології формування оксидних шарів на сплаві титану ОТ4–0". Thesis, НТУ "ХПІ", 2016. http://repository.kpi.kharkov.ua/handle/KhPI-Press/21923.

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Дисертація на здобуття наукового ступеня кандидата технічних наук за спеціальністю 05.17.03 – технічна електрохімія. – Національний технічний університет "Харківський політехнічний інститут", Харків, 2016 р. Дисертація присвячена удосконаленню технології оксидування сплаву титану ОТ4–0 для створення матеріалів з протикорозійними та каталітичними властивостями. Обґрунтовано склад електролітів і експериментально визначено вплив режимів оксидування на склад, морфологію та властивості оксидних покриттів. Розроблено технологію мікродугового оксидування сплаву титану ОТ4–0 для одержання оксидних композицій Ti/TiOx∙CeOy, Ti/TiOx∙CeOy∙ZrOz, Ti/TiOx∙CeOy∙ZrOz∙CuOn. Експериментально встановлено, що церійвмісні оксидні шари виявляють високу каталітичну активність у реакціях окиснення бензолу та конверсії СО, а введення іонів міді та цирконію у церійвмісні МДО- покриття знижує температуру конверсії СО. Запропоновано склади електролітів для формування цирконій- та молібденвмісних оксидних покриттів із підвищеною термостійкістю. Визначено корозійну стійкість синтезованих матеріалів та їх каталітичну активність в модельній реакції конверсії монооксиду карбону та бензолу.
Thesis for granting the Degree of Candidate of Technical sciences in speciality 05.17.03 – Technical Electrochemistry. – National Technical University "Kharkiv Politechnical Institute", 2016. The thesis is dedicated to improvement of titanium alloy ОТ4–0 oxidizing technology for the creation of materials with anticorrosive and catalytic properties. The electrolytes composition and oxidation mode influence on the oxide coating composition, morphology and properties was established. The technology of titanium alloy ОТ4–0 microarc oxidation, the oxide composition Ti/TiOx∙CeOy, Ti/TiOx∙CeOy∙ZrOz, Ti/TiOx∙CeOy∙ZrOz∙CuOn synthesis was developed. The cerium-containing oxide layers show high catalytic activity in oxidation benzene and monoxide carbon; insertion cuprum and zirconium ions in cerium-containing oxide layers decrease monoxide carbon conversion temperature experimentally established. The electrolytes composition for zirconium- and molybdenum-containing thermostable oxide coatings synthesis is proposed. The synthesized materials corrosion resistance and catalytic activity in the model reaction of carbon monoxide conversion were determined.

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Tang, Ling. "MODIFICATION OF SOLID OXIDE FUEL CELL ANODES WITH CERIUM OXIDE COATINGS." Case Western Reserve University School of Graduate Studies / OhioLINK, 2009. http://rave.ohiolink.edu/etdc/view?acc_num=case1244252739.

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Blair, Susanna Whitman. "Nd isotopes investigation of Cretaceous Ocean Anoxic Event 2 and a systematic study of Fe-Mn oxide coatings /." [Gainesville, Fla.] : University of Florida, 2006. http://purl.fcla.edu/fcla/etd/UFE0015647.

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Akanda, Sajedur R. "Mechanical Characterization of Coating-Interconnect Interfaces and Anode-Electrolyte Interfaces for Solid Oxide Fuel Cells." The Ohio State University, 2012. http://rave.ohiolink.edu/etdc/view?acc_num=osu1356969023.

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Sieber, Maximilian. "Elektrochemisches Modell zur Beschreibung der Konversion von Aluminium durch anodische Oxidation." Doctoral thesis, Universitätsbibliothek Chemnitz, 2017. http://nbn-resolving.de/urn:nbn:de:bsz:ch1-qucosa-216761.

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Durch elektrochemische Impedanzspektroskopie während der anodischen Oxidation von Aluminium werden in der vorliegenden Arbeit die elektrochemischen Vorgänge während der Oxidbildung quantitativ und zeitabhängig untersucht. Es wird ein Modell vorgeschlagen und diskutiert, welches das Impedanzverhalten während der anodischen Oxidation in Schwefel-, Oxal- und Phosphorsäure über einen großen Bereich von Konzentrationen und Stromdichten abbilden kann. Aus den gewonnenen Ergebnissen werden die kapazitive Wirkung der Sperrschicht am Porengrund, der Eintritt von Ladungsträgern in die Sperrschicht, der Ionentransport durch die Sperrschicht sowie die Oxidbildungsreaktion selbst als wesentlich für das Impedanzverhalten identifiziert. Die ermittelten Zusammenhänge und Konstanten können als Grundlage für Modellvorstellungen dienen, welche das Verhalten elektrischer Prozessgrößen und die Ausbildung der charakteristischen Oxidstruktur bei der anodischen Oxidation von Aluminium verknüpfen
In the present work, the electrochemical subprocesses of the oxide formation on aluminium by anodic oxidation are investigated using electrochemical impedance spectroscopy. The time dependence of the impedance behaviour and the quantitative relations between the process parameters and the impedance behaviour are considered. A model for the representation of the electrochemical behaviour during the anodic oxidation in sulphuric, oxalic and phosphoric acid is proposed and discussed for a wide range of anion concentrations and current densities. On the basis of the obtained results, the capacitive effect of the barrier layer, the charge transfer resistance of the barrier layer, the ion transport within the barrier layer and the oxide formation are identified as the dominating effects for the impedance behaviour. The established relations can serve as a basis for models, which interrelate both the electrochemical behaviour and the geometrical formation of the characteristic pore structure

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You, Sheng Mu. "Metal organic frameworks as efficient photosensitizer for TiO₂ nanoarray anode and application to water splitting in PEC cells Fe/Ni Bimetallic organic framework deposited on TiO₂ nanotube array for enhancing higher and stable activity of oxygen evolution reaction Novel nano-architectured water splitting photoanodes based on TiO₂-nanorod mats surface sensitized by ZIF-67 coatings Surface sensitization of TiO₂ nanorod mats by electrodeposition of ZIF-67 for water photo-oxidation Electrochemically capacitive deionization of copper (II) using 3D hierarchically reduced graphene oxide architectures." Thesis, université Paris-Saclay, 2020. http://www.theses.fr/2020UPASF015.

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Les réserves de combustibles fossiles diminuent et leur utilisation illimitée depuis la révolution industrielle a généré de profonds changements du climat, notamment des cycles de la température atmosphérique. Stocker l'énergie solaire sous forme d'hydrogène produit par dissociation de l'eau est un moyen idéal pour combattre le réchauffement climatique. Les matériaux de la famille des «metal organic framework» (MOF) commencent à être utilisés comme photo-électrocatalyseurs, notamment pour la photo-dissociation de l'eau. Leur porosité extrêmement élevée et leur grande polyvalence, tant chimique que structurelle, les désignent comme des candidats potentiels pour faciliter l'absorption du rayonnement solaire et catalyser la dissociation de l'eau dans les cellules photoélectrochimiques. En contrôlant la composition chimique et le dopage du linker utilisé dans le MOF, il est possible d'ajuster l'énergie de la bande interdite, de favoriser la fonctionnalisation sur des substrats très variés ou encore d'ajuster leur résistance à la corrosion dans divers environnements chimiques. Ce sont donc des matériaux d'un grand intérêt pour la catalyse, l'électrocatalyse ou la photo-électro-catalyse. D'autre part, le TiO₂ nano-structuré, par exemple sous forme de tapis d’épaisseur micrométrique de nanotubes ou de nanofils, parfois appelé TNA, est un matériau bien adapté à la construction de photoanodes pour le dégagement d'oxygène en milieu aqueux. Il a déjà été largement étudié et décrit dans la littérature. Au cours de notre thèse, nous avons fabriqué des matériaux composites constitués de MOF de métaux de transition (Ni, Co, Fe) déposés sur TNA (TDNR et TNTA). Pour cela, nous avons utilisé une méthode électrochimique d'électrodéposition. Cela nous a permis de déposer des nanoparticules métalliques sur du TNA à potentiel fixe - 1,0 V puis de les transformer par réaction chimique avec des ligands organiques (BTC, BDC, et 2MZ) par voie thermo-thermique. Les matériaux obtenus présentent une activité électrocatalytique significative et une excellente durabilité photoélectrochimique. Ces matériaux composites ont été utilisés avec succès comme phase active dans des photo-électrodes pour la réaction de dégagement d'oxygène moléculaire (OER)
The fossil fuel reserves are dwindling and their unrestricted use has generated profound changes in Earth's surface temperature and climate. Storing solar energy in the form of hydrogen produced by dissociation of water is an ideal way to mitigate global warming. Materials from the “metal organic framework” (MOF) family are starting to be used as photo-electrocatalysts, especially for photo-dissociation of water. Their extremely high porosity and their great versatility, both chemical and structural, designate them as potential candidates to facilitate the absorption of solar radiation and catalyze the dissociation of water in photoelectrochemical cells. By controlling the chemical composition and doping of the linker used in the MOF, it is possible to adjust the band gap energy, to favor the functionalization on very varied substrates or even to adjust their resistance to corrosion in various chemical environments. They are therefore materials of great interest for catalysis, electrocatalysis or photo-electro-catalysis. On the other hand, nano-structured TiO₂, for example in the form of nanotube or nanowire mats, sometimes called TiO₂ nanoarray (TNA), is a material very suitable for the construction of photoanodes for the evolution of oxygen in aqueous medium. It has already been extensively studied and described in the literature. During our thesis, we manufactured composite materials made up of MOFs of transition metals (Ni, Co, Fe) deposited on TNA (network of nanotubes or nanowires). For this we used an electrochemical method of electrodeposition (cyclic voltammetry). This allowed us to deposit metallic nanoparticles on TNA with fixed potential - 1.0 V and then transform them by chemical reaction with organic ligands (1,3,5-benzenetricarboxylic acid, BTC, 1,4-benzenedicarboxylic acid, BDC and imidazole, 2MZ) by thermal-thermal route. The materials obtained exhibit significant electrocatalytic activity and excellent photoelectrochemical durability. These composite materials have been successfully used as an active phase in photo-electrodes for the oxygen release reaction (OER)

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Chang, Hao-Hsiang, and 張皓翔. "Improvement of PEMFC Performance by Coating Reduced Graphene Oxide on the Anode Gas Diffusion Layer." Thesis, 2018. http://ndltd.ncl.edu.tw/handle/ys5278.

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碩士
國立中興大學
材料科學與工程學系所
106
Proton exchange membrane fuel cells have the advantages of high conversion efficiency, high energy density, fast and easy operation, and zero pollution. However, the production of fuel cells still needs to overcome many challenges. The poor dispersion of catalysts, the high price of platinum, and the difficulty in mastering water management are all problems that cannot improve the performance of PEMFC. Therefore, the first part of the experiment will mainly discuss how to increase the dispersibility of Pt particles on the carbon black carrier. In this study, the surface of carbon black was surface-modified with hydrogen peroxide, and the surface of carbon black was filled with oxygen-containing functional groups to increase the dispersibility of carbon black in water. From the XRD pattern, the Pt particle size decreases from 6.56 nm to 4.26 nm.It was confirmed that the surface treatment of carbon black by hydrogen peroxide really reduce the occurrence of Pt agglomeration. The second part will combine the one-dimensional carbon black structure with two-dimensional graphene to form a new 3D composite structure. It is expected that the high specific surface area of graphene will increase the dispersion of carbon black and make Pt more distributed during reduction. However, it was found by SEM and TEM that agglomeration occurred, and the current density decreased with the increase of graphene addition, mainly due to the poor interaction between graphene and Pt. The third part will mainly discuss the coating of graphene on the anode gas diffusion layer to improve water management and use the high conductivity of graphene to reduce the occurrence of polarization. From the contact angle analysis results, it is found that the contact angle decreases with the increase of the amount of reduced graphene oxide coating, indicating that the hydrophilicity is increased, and the wetting effect can be achieved to help the hydrogen ion transfer. At 65°C operating temperature, the power density of coating 2.52mg/cm2 reduced graphene oxide increased from 0.395 W/cm2 to 0.538 W/cm2. It was confirmed that coating graphene oxide on anode gas diffusion layer can really increase efficiency.

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Частини книг з теми "Anodic oxide coatings"

Wei, Weifeng, Sofianne Benhaddad, Anthony Wood, Weixing Chen, and Douglas G. Ivey. "Anodic Electrodeposition of Mn-Co-O Spinel Coatings on Stainless Steel Substrates." In Advances in Solid Oxide Fuel Cells III, 255–66. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2009. http://dx.doi.org/10.1002/9780470339534.ch24.

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Verma, Naveen, Jitender Jindal, Krishan Chander Singh, and Anuj Mittal. "Anodic Oxide Nanostructures: Theories of Anodic Nanostructure Self-Organization." In Advanced Coating Materials, 235–54. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2018. http://dx.doi.org/10.1002/9781119407652.ch8.

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Prengaman, R. D., and A. Siegmund. "New Wrought Pb-Ag-Ca Anodes for Zinc Electrowinning to Produce a Protective Oxide Coating Rapidly." In Lead-Zinc 2000, 589–98. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2013. http://dx.doi.org/10.1002/9781118805558.ch39.

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Bunker, Bruce C., and William H. Casey. "Oxide Films in Metal Corrosion: Oxide Defect Chemistry." In The Aqueous Chemistry of Oxides. Oxford University Press, 2016. http://dx.doi.org/10.1093/oso/9780199384259.003.0019.

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Most metals used by our society corrode, from the mild tarnish on silver to the green patina that coats our copper statues and electrical wiring to the red rust on our cars and iron bridges (Fig. 12.1, Plate 17). Metal corrosion often involves the conversion of metals into either oxides or their soluble hydrolysis products. The metals we use in our structures, as well as in electronic and magnetic devices, are destroyed as a result of this conversion. It has been estimated that the annual cost of metallic corrosion to the U.S. economy is hundreds of billions of dollars (5% of the gross national product). Therefore, enormous efforts have been made to understand why metals corrode, and what can be done to inhibit corrosion processes. Stainless steel is just one example of humankind’s attempts to limit corrosion processes. Other examples include the use of inert paints on ships to prevent saline corrosion, coating iron with zinc to galvanize it, and exploiting electrochemical strategies, such as using sacrificial anodes that corrode instead of iron, as a means of protecting more important materials’ components. The number of comprehensive texts and reviews regarding metal corrosion scales with its economic impact, with more than 1000 articles being published on the topic per year. Those of you interested in more comprehensive discussions regarding how specific metals corrode in specific environments such as seawater and acid rain should see other works. Our focus in this chapter is to highlight how metal corrosion is mediated by the presence of oxides, with an emphasis on reactions that occur in water. This overview highlights the basic properties of oxide films that give rise to a wide range of complicated metal corrosion phenomena. The discussion draws on many concepts highlighted in other chapters of this book: surface chemistry (Chapter 6), electrochemistry (Chapter 11), and oxide dissolution (Chapter 16). Metal corrosion often involves electrochemical reactions in which the metal is oxidized by either water or O2.

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Тези доповідей конференцій з теми "Anodic oxide coatings"

Degtyar, L. A., K. V. Ovchinnikova, I. Y. Zhukova, and A. A. Kuts. "ANODIC PROCESSES DURING ELECTRODEPOSITION OF NICKEL, ITS ALLOYS AND COMPOSITE COATINGS." In INNOVATIVE TECHNOLOGIES IN SCIENCE AND EDUCATION. DSTU-Print, 2020. http://dx.doi.org/10.23947/itno.2020.185-188.

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The results of investigations of the anodic processes of electrodeposition of nickel, nickel-boron alloy, composite coatings nickel-ultrafine diamond and nickel-cobalt-aluminum oxide are presented. It was shown that the oxidation of the boron-containing additive occurs at potentials much more positive than the oxidation potential of nickel, which means that oxidation of the boron compound is impossible under real conditions of electrodeposition. During the electrodeposition of CEC, the anode process proceeds without any complications and the dissolution of the anodes occurs in the same way as in nickel-plating electrolytes, and the composite additives of UDD and Al2O3 do not affect the anodic processes.

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Muratova, Ekaterina N., Danil A. Amsharinsky, Svetlana S. Nalimova, and Oleg A. Korepanov. "Anti-Reflective Metal Oxide / Porous Anodic Alumina Composite Coatings on Flexible Substrates." In 2022 Conference of Russian Young Researchers in Electrical and Electronic Engineering (ElConRus). IEEE, 2022. http://dx.doi.org/10.1109/elconrus54750.2022.9755740.

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Demidov, M. A., and M. YU Kuz'mina. "Obtaining and possible use in industry of anodic oxide coatings on the surface of aluminum products and its alloys." In Scientific dialogue: Young scientist. ЦНК МОАН, 2019. http://dx.doi.org/10.18411/spc-22-10-2019-02.

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Dvorak, M., and P. Heimgartner. "Assessment of HVOF Coatings for Wet Corrosion Protection." In ITSC 1998, edited by Christian Coddet. ASM International, 1998. http://dx.doi.org/10.31399/asm.cp.itsc1998p0095.

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Abstract Until now the use of thermal sprayed metallic coatings for wet corrosion protection is limited to applications where the coating (Al-alloys, Zn-alloys and their mixtures) acts as an anode to protect the substrate or special cases, where thick cold sprayed metallic layers give good results. Other atmospheric cold sprayed layers made of corrosion resistant Ni, Co, Cu or Fe base alloys have their limitations due to the process related discontinuities like pores and oxide films. In more aggressive environments thermal sprayed and fused layers made of so called self-fluxing Ni and Co based alloys are commonly applied. Also in some applications the use of specially designed gas shrouds or of spraying techniques running in inert gas atmospheres or vacuum can yield protective coating solutions. However, these techniques have high investment or service costs or the size of the parts to be coated is restricted. Recent developments in HVOF-spraying open new possibilities in applying cold sprayed coatings on site with good corrosion resistance. The aim of this paper is on one hand to give a comparative overview about the wet corrosion behaviour of thermally sprayed metallic coatings using different spraying techniques related to the performance of the corresponding bulk materials and on the other hand to demonstrate the potential of a new generation of coatings to protect or repair structures exposed to aggressive environments. Keywords: corrosion behavior, thermal sprayed metallic coatings, cermet coatings HVOF, HVIF, PTAW.

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Jalilvand, Vahid, Ali Dolatabadi, Christian Moreau, Saeed Mohammadkhani, Lionel Roué, and Daniel Guay. "Formation of Solid Solution and Metallic Nickel Phases During Suspension Plasma Spraying of Co Oxide and Ni Oxide." In ITSC2021, edited by F. Azarmi, X. Chen, J. Cizek, C. Cojocaru, B. Jodoin, H. Koivuluoto, Y. C. Lau, et al. ASM International, 2021. http://dx.doi.org/10.31399/asm.cp.itsc2021p0515.

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Abstract The focus of this study is the formation of a solid solution and metallic nickel in the cobalt-nickel mixed oxide coatings during suspension plasma spray (SPS) deposition. The (Co,Ni)O solid solution is a potential material for inert anode applications in aluminum production. SPS coatings and in-flight collected particles are studied to gain further insight into the melting and mixing phenomena of the NiO and CoO powders as well as phase formation in the deposited coatings. Moreover, the role of suspension feedstock particle sizes on the microstructure of coatings is discussed. SEM, EDS and X-ray diffraction studies helped better understanding the formation of different crystalline phases within the as-sprayed coatings. It was found that the formation of metallic nickel is possible in the coatings. The results support the importance of substrate temperature on the formation of metallic Ni, so that keeping the substrate at low temperature results in an increase of the Ni content in the coatings. In this study, possible causes for the formation of metallic Ni during spraying are discussed.

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Barbezat, G., and K. Landes. "Plasma Technology TRIPLEX for the Deposition of Ceramic Coatings in the Industry." In ITSC 2000, edited by Christopher C. Berndt. ASM International, 2000. http://dx.doi.org/10.31399/asm.cp.itsc2000p0881.

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Abstract As a new plasma gun technology the TRIPLEX system has been introduced in the industrial field two years ago. The core of the TRIPLEX technology is a plasma gun with three cathodes and a long cascaded nozzle consisting of several insulated rings. Only the last ring with a relatively long distance to the cathode is operated as anode. Because of the equal and constant lengths of the three independent arcs, stretching from the three cathodes to the common anode, a stationary plasma jet is generated. Compared to conventional torches, the improved stability of the plasma jet allows a more uniform powder treatment and a higher deposition efficiency as well as the powder feed rate can be increased using a triple injection system. A significantly longer life time of the electrodes reduces the cost for quality control in the coating process. The characteristic properties of oxide ceramic coatings are improved in comparison with the coatings produced by conventional plasma torches. The results of two years industrial application of the innovative torch system TRIPLEX are presented in the paper.

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Persky, J., D. Beeaff, S. Menzer, D. Storjohann, and G. Coors. "Spray Coating of Electrolyte Films for Solid Oxide Fuel Cells." In ASME 2008 6th International Conference on Fuel Cell Science, Engineering and Technology. ASMEDC, 2008. http://dx.doi.org/10.1115/fuelcell2008-65100.

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Fabrication of defect free co-sintered electrolytes with thickness between 12 μm and 40μm has been demonstrated on planar and tubular cells produced via a spray coating process. Leak testing using a helium leak method showed low diffusional leak rates for cells using optimized spray parameters. The electrolytes were characterized using scanning electron microscopy to qualitatively assess pin holes. Average open circuit voltages (OCVs) of 1080 mV were obtained on tubular cells with spray-coated electrolytes using 3% humidified hydrogen as the fuel. This paper presents spray coating as a viable, cost effective method for electrolyte application in co-fired, anode supported SOFCs.

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Lutey, Adrian H. A., Alessandro Fortunato, Alessandro Ascari, Simone Carmignato, and Leonardo Orazi. "Pulsed Laser Ablation of Lithium Ion Battery Electrodes." In ASME 2014 International Manufacturing Science and Engineering Conference collocated with the JSME 2014 International Conference on Materials and Processing and the 42nd North American Manufacturing Research Conference. American Society of Mechanical Engineers, 2014. http://dx.doi.org/10.1115/msec2014-3967.

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Lithium ion battery electrodes have been exposed to 1064nm nanosecond pulsed laser irradiation with pulse energy in the range 8μJ – 1mJ and fluence in the range 3.2 – 395J/cm2. Experiments have been executed at translational velocities of 100mm/s and 1m/s, allowing individual characterization of the graphite and lithium metal oxide coatings of the copper anode and aluminum cathode, respectively, as well as that of the complete multi-layer structures. A 3D optical profiler has been utilized to measure the incision depth of all samples and allow observation of the process quality. At high velocity, partial or complete removal of the upper coating layers was achieved with little or no impact on the underlying metallic layers. At low velocity, complete cuts were possible under certain conditions, with process efficiency found to be almost entirely governed by the response of the metallic layers. While the coating layers of each electrode exhibited different responses than the metallic layer, the influence of the latter was found to be dominant for cutting operations. Shorter pulses with fluence in the range 30 – 60J/cm2 were found to lead to optimum process outcomes with the employed laser source.

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Kurita, Hirotaka, Hiroshi Yamagata, Toshikatsu Koike, and Ikuo Mita. "Hard Anodic Oxide Coating on the Piston-Ring Groove of a Cu-Rich Aluminum Piston with Mixed Acid Electrolytes." In SAE 2001 World Congress. 400 Commonwealth Drive, Warrendale, PA, United States: SAE International, 2001. http://dx.doi.org/10.4271/2001-01-0821.

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Mueller, M., R. Henne, G. Schiller, M. I. Boulos, F. Gitzhofer, and R. B. Heimann. "Radio-Frequency Suspension Plasma Spraying of Cobalt Spinel Anodes for Alkaline Water Electrolysis." In ITSC 1998, edited by Christian Coddet. ASM International, 1998. http://dx.doi.org/10.31399/asm.cp.itsc1998p1523.

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Abstract Suspensions of cobalt spinel (Co3O4) powders (median size 6 µm and 0.3 µm) were r.f. plasma sprayed to form electrocatalytically active anode layers for alkaline water electrolysis. Stable cobalt oxide suspensions of low viscosity and exceeding 50wt.% solid phase content have been processed. A spheroidization study revealed the formation of large spherical powder particles (- 30 + 80 µm). Cobalt oxide coatings were produced by this novel r.f.-Suspension Plasma Spraying (SPS) method. The porosity was controlled by optimizing the spray distance and the reactor pressure. The main disadvantage of the thermal plasma processing of cobalt spinel, i.e. the decomposition of the spinel phase into CoO, could not be prevented, not even with the application of an 80% oxygen plasma. With a relatively low power oxygen plasma post-treatment the deposited CoO layers can be oxidized to Co3O4 resulting in a promising improvement of the electrochemical performance of the anode layers.

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Звіти організацій з теми "Anodic oxide coatings"

Author, Not Given. Healing defects in anodic aluminum oxide coatings using sol-gel materials -- A screening study using the product of capacitance and breakdown voltage as a figure of merit. Office of Scientific and Technical Information (OSTI), December 1995. http://dx.doi.org/10.2172/10130058.

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