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Автор: Grafiati
Опубліковано: 8 червня 2024

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1

da Forno, Anna, Liu Ke, and Massimiliano Bestetti. "Effect of Titania Nanoparticles on Micro-Arc Anodizing of AM60B Magnesium Alloy." Materials Science Forum 654-656 (June 2010): 1876–79. http://dx.doi.org/10.4028/www.scientific.net/msf.654-656.1876.

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Oxide films have been produced on the AM60B magnesium alloy using micro-arc oxidation process in an environmentally friendly alkaline solution with and without addition of titania nanoparticles. The surface morphology and cross-section of anodized samples were analyzed by Scanning Electron Microscopy (SEM) coupled with EDS and the phase composition was investigated by X-ray Diffraction (XRD). Hardness tests were performed by means of a micro-hardness tester and the corrosion resistance was evaluated in 3.5% NaCl solution using potentiodynamic polarization tests. Addition of titania nanoparticles doesn’t affect corrosion resistance significantly, but the oxide films produced in titania-containing solution are denser, thicker and have more uniform morphology. In the oxides produced at 130V-140V in presence of titania (4g dm-3) a spinel (MgAl2O4) was observed. Spinel phase increases the hardness up to 550 HV (10mN, 10 s). The addition of titania nanoparticles in the solution could be an interesting way to synthesize hard coatings on magnesium alloy AM60B by micro-arc oxidation in a short process time (10 minutes).
2

Oh, Han Jun, Jong Ho Lee, and Choong Soo Chi. "Photocatalytic Characteristics of Titania Thin Film Prepared by Micro Arc Oxidation." Key Engineering Materials 543 (March 2013): 141–44. http://dx.doi.org/10.4028/www.scientific.net/kem.543.141.

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Anodic titania film was synthesized by electrochemical micro plasma oxidation method in H2SO4/NH4NO3 electrolyte, and electrochemical anodizing was carried out at various electrolyte temperatures. The photocatalytic properties and surface characteristics of anodic titania film were investigated. For anodic titania film synthesized at higher electrolyte temperature, the specific surface area of anodic film and the anatase crystalline phase gradually increased. The anodic titania film fabricated in high temperature electrolyte showed not only a slight red shift related to increasing the anatase phase ratio but also a high efficiency of dye degradation.
3

Scriabin, M. L. "Theoretical aspects of formation of oxide films on aluminum alloys when oxidized in aqueous electrolytes." Informacionno-technologicheskij vestnik 15, no. 1 (March 30, 2018): 182–89. http://dx.doi.org/10.21499/2409-1650-2018-1-182-189.

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The article deals with the theoretical aspects of the formation of oxide films on piston aluminum alloys at micro-arc oxidation. Possible schemes of formation of barrier and outer layers of surface coating in aqueous electrolytes are also considered. The mechanism of formation of the interface and possible deposition schemes of non-metallic inclusions on the surface are shown. The stage-by-stage formation of oxide layers on the surface of the piston, which has a fundamental difference from conventional films obtained during anodizing, is described.
4

Yang, Kai, Haisong Huang, Jiadui Chen, and Biao Cao. "Discharge Behavior and Dielectric Breakdown of Oxide Films during Single Pulse Anodizing of Aluminum Micro-Electrodes." Materials 12, no. 14 (July 17, 2019): 2286. http://dx.doi.org/10.3390/ma12142286.

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Micro-arc discharge events and dielectric breakdown of oxide films play an important role in the formation process of plasma electrolytic oxidation coating. Single pulse anodization of micro-electrodes was employed to study the discharge behavior and dielectric breakdown of oxide films deposited on aluminum in an alkaline silicate electrolyte. Voltage and current waveforms of applied pulses were measured and surface morphology of micro-electrodes was characterized from images obtained using scanning electron microscope (SEM). A feasible identification method for the critical breakdown voltage of oxide film was introduced. Different current transients of voltage pulses were obtained, depending on applied pulse voltage and duration. In addition, the active capacitive effect and complex non-linear nature of plasma electrolytic oxidation process is confirmed using dynamic electrical characteristic curves. A good correlation between the pulse parameters and shape of discharge channels was observed. Circular opened pores were found to close with increasing potential and pulse width. Finally, the characteristic parameters of a single discharge event were estimated.
5

Veys-Renaux, Delphine, and Emmanuel Rocca. "Initial stages of multi-phased aluminium alloys anodizing by MAO: micro-arc conditions and electrochemical behaviour." Journal of Solid State Electrochemistry 19, no. 10 (July 2, 2015): 3121–29. http://dx.doi.org/10.1007/s10008-015-2935-3.

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6

da Forno, Anna, and Massimiliano Bestetti. "A Composite Coating for Corrosion and Wear Protection of AM60B Magnesium Alloy." Advanced Materials Research 138 (October 2010): 79–84. http://dx.doi.org/10.4028/www.scientific.net/amr.138.79.

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In this paper a protection process against corrosion and wear for AM60B magnesium alloys, by multilayer approach, is related. The coating consists of a porous oxide layer, obtained in micro-arc anodizing regime, and two or three layers deposited by sol-gel technique. The anodic oxidation pre-treatment improves the adhesion of the sol-gel layers, which are responsible for the sealing of the anodic oxide pores and for the corrosion protection effect. In addition the multilayer system significantly improves AM60B alloy wear resistance. Scanning Electron Microscopy (SEM) and X-Ray Diffraction (XRD) were employed to assess morphology and crystallographic structure. Electrochemical polarization and wear tests were performed in order to evaluate the corrosion resistance behaviour and the wear resistance of the coated magnesium alloys.
7

Santos, Emanuel, Gelson B. de Souza, Francisco C. Serbena, Henrique L. Santos, Gabriel G. de Lima, Eduardo M. Szesz, Carlos M. Lepienski, and Neide K. Kuromoto. "Effect of anodizing time on the mechanical properties of porous titania coatings formed by micro-arc oxidation." Surface and Coatings Technology 309 (January 2017): 203–11. http://dx.doi.org/10.1016/j.surfcoat.2016.11.063.

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8

Veys-Renaux, Delphine, Emmanuel Rocca, Julien Martin, and Gérard Henrion. "Initial stages of AZ91 Mg alloy micro-arc anodizing: Growth mechanisms and effect on the corrosion resistance." Electrochimica Acta 124 (April 2014): 36–45. http://dx.doi.org/10.1016/j.electacta.2013.08.023.

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9

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.
10

Awad, Samir. "ANEW METHOD FOR DEPOSITION OF CERAMIC COATING ON AL ALLOY USING DUPLEX PROCESSES OF ANODIZING AND AL2O3MODIFIED ELECTROLYTE MICRO-ARC OXIDATION (MAO)." IRAQI JOURNAL FOR MECHANICAL AND MATERIALS ENGINEERING 19, no. 3 (September 8, 2019): 17. http://dx.doi.org/10.32852/iqjfmme.v19i3.375.

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ABSTRACTIn this work, surfaces of Al 6061 alloy were coated using anodizing and micro–arc oxidation ( MAO) duplex processes. MAO electrolyte was modified using ( 2-6 g/l )Al2O3 additives . X-ray diffraction (XRD), scanning electron microscopy (SEM), Vickers indenter, atomic force microscopy (AFM), and Microprocessor coating thickness meter ,were employed for characterization of the deposited coatings .Results showed that the coatings contained porous oxide ?-alumina with morphologies characterized by different levels of porosity non-uniform distribution, and their thickness and hardness increased by the increasing of Al2O3 additives. The research demonstrates that a relatively hard (421-490Hv), thick (43-65?m) and uniform coatings, can successfully be deposited on preanodized Al alloy (12-15 ?m with hardness of 190Hv) using Al2O3 additives containing MAO electrolytes as a new method for more future research on surface improvements of Al alloys.
11

Hamid Awad, Samir. "NEW METHOD FOR DEPOSITION OF CERAMIC COATING ON AL ALLOY USING DUPLEX PROCESSES OF ANODIZING AND Al2O3 MODIFIED ELECTROLYTE MICRO -ARC OXIDATION (MAO)." IRAQI JOURNAL FOR MECHANICAL AND MATERIALS ENGINEERING 20, no. 4 (December 29, 2020): 308–22. http://dx.doi.org/10.32852/iqjfmme.v20i4.526.

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In this work, surfaces of Al 6061 alloy were coated using anodizing and micro–arc oxidation ( MAO) duplex processes. MAO electrolyte was modified using ( 2-6 g/l )Al2O3 additives . X-ray diffraction (XRD), scanning electron microscopy (SEM), Vickers indenter, atomic force microscopy (AFM), and Microprocessor coating thickness meter ,were employed for characterization of the deposited coatings .Results showed that the coatings contained porous oxide ?-alumina with morphologies characterized by different levels of porosity non-uniform distribution, and their thickness and hardness increased by the increasing of Al2O3 additives. The research demonstrates that a relatively hard (421-490Hv), thick (43-65?m) and uniform coatings, can successfully be deposited on preanodized Al alloy (12-15 ?m with hardness of 190Hv) using Al2O3 additives containing MAO electrolytes as a new method for more future research on surface improvements of Al alloys
12

Li, Linwei, Erhui Yang, Zhibin Yan, Xiaomeng Xie, Wu Wei, and Weizhou Li. "Effect of Pre-Anodized Film on Micro-Arc Oxidation Process of 6063 Aluminum Alloy." Materials 15, no. 15 (July 28, 2022): 5221. http://dx.doi.org/10.3390/ma15155221.

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In the current investigation, micro-arc oxidation (MAO) ceramic coatings on aluminum are galvanostatically synthesized at various processing stages in an alkaline silicate system. The resultant coatings are systematically investigated in terms of the following respects: The working voltage and surface sparking evolution over the studied course of MAO are recorded by the signal acquisition system and the real-time imaging, respectively; the phase composition, the surface morphology, and the polished cross-section of the coatings are characterized by X-ray diffraction (XRD) and scanning electron microscopy (SEM) assisted with an energy-dispersive X-ray spectrometer (EDS), respectively. In particular, with the help of a low-rate increase in working voltage, the evolution of the sparks, the energy consumption, and the microstructure development of aluminum in alkaline silicate electrolyte by pre-anodizing are systematically investigated. The results show that the pre-anodized film can accelerate the evolution process of MAO spark and shorten the reaction process in the early stage of MAO reaction, reducing energy consumption and improving the corrosion resistance of the MAO coating. The γ-Al2O3 phase content after pre-anodized is significantly increased in MAO coatings. In particular, the thicker the pre-anodized film (beyond 8 μm) was broken down and fragmentation thinning in the early stage of the MAO process with the presence of micro discharges. This is due to the fact that the electron transition will be released by the emission of radiative recombination and reveals obvious galvanoluminescence (GL) behavior on the surface of the pre-anodized film. Further, based on the present MAO coating microstructure, a model of coating growth after pre-anodized that evolves over time is proposed.
13

Dela Pena, Eden May Bayungan, and Salvacion Orgen. "Effect of Electrolyte Concentration and Voltage on the Morphology and Corrosion Resistance of PEO Coated AA6061." ECS Meeting Abstracts MA2023-02, no. 13 (December 22, 2023): 1125. http://dx.doi.org/10.1149/ma2023-02131125mtgabs.

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Aluminum and its alloys are among the most extensively used materials in aerospace and industrial applications owing to its high specific strength, low density, and high abundance on the earth’s crust. However, low hardness, high tendency to adhesion, high corrosion, and poor wear resistance limits its further application. Surface treatments like electroplating, PVD/CVD, and anodizing are proposed to form a protective coating on the surface of Al and its alloys. Plasma Electrolytic Oxidation (PEO), known as micro-arc oxidation (MAO), emerged as a promising surface coating technique producing high-quality ceramic coating for light metal alloys like Al, Mg, Ti, and their alloys. PEO is similar to conventional anodizing but at a higher voltage exceeding its breakdown voltage, forming plasma discharge. In this study, the PEO of AA6061 was carried out in an AC power source at constant voltage 325-400 V, 1000 Hz, and 80 % duty cycle for 30 min. Silicate-based electrolytes of different concentrations (5-10 g/L) Na2SiO3 and (5-10 g/L) KOH were utilized, maintaining 25-40°C electrolyte temperature. The effect of electrolyte concentration and constant voltage on the coating morphology and its relation to hardness were investigated. Surface morphology, cross-section, elemental distribution, and phase composition were characterized using SEM, EDX, and XRD. Different breakdown voltages were determined for each electrolyte concentration. A lower breakdown voltage was achieved at a higher concentration. Porous with pancake-like structure, crater, and nodular structures were observed with coating thickness ranges from 8.37-87.33µm. α-alumina and Ƴ-alumina peaks were detected in all surface coatings.
14

Tsai, Dah-Shyang, and Chen-Chia Chou. "Influences of Growth Species and Inclusions on the Current–Voltage Behavior of Plasma Electrolytic Oxidation: A Review." Coatings 11, no. 3 (February 25, 2021): 270. http://dx.doi.org/10.3390/coatings11030270.

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Plasma electrolytic oxidation (PEO) has attracted increasing attention since the transportation industry adopts more lightweight metal components and requires an improved version of anodizing for surface protection. In response to the demand, researchers enrich the technical connotation of PEO through diversifying the growth paths and adopting new precursors. Foreign electrolyte additives, involving ceramic and polymeric particles, organic dye emulsions, are incorporated to accomplish various goals. On the other hand, significant progress has been made on comprehension of softening sparks; denoting the adverse trend of growing discharge intensity can be re-routed by involving cathodic current. I–V response shows the cathodic pulse current not only cools down the ensuing anodic pulse, but also twists the coating conductivity, and the residuals of twists accumulate over a long time frame, plausibly through oxide protonation. Thus, the cathodic current provides a tool to control the discharge intensity via integration of the coating conductivity deviations. So far, these cathodic current studies have been performed in the electrolytes of KOH and Na2SiO3. When exotic additives are included, for example Cr2O3, the cathodic current effect is also shifted, as manifested in remarkable changes in its current–voltage (I–V) behavior. We anticipate the future study on cathodic current influences of inclusion shall lead to a precise control of micro arc.
15

Kumar, S. Anand, Sritam Pradhan, S. Ganesh Sundara Raman, and R. Gnanamoorthy. "Performance of alumina coatings prepared by hard anodizing, micro arc oxidation and detonation spray processes on Al–Mg–Si alloy under fretting wear loading." Proceedings of the Institution of Mechanical Engineers, Part J: Journal of Engineering Tribology 228, no. 4 (December 9, 2013): 454–62. http://dx.doi.org/10.1177/1350650113513756.

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16

"Electronoptical Observations for Micro Arc Initiation of Anodic Films during Anodizing of Mg in Aqueous Electrolyte." ECS Meeting Abstracts, 2009. http://dx.doi.org/10.1149/ma2009-02/21/1930.

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