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Academic literature on the topic 'Potentiodynamic polarization measurement'

Author: Grafiati
Published: 10 December 2022
Last updated: 28 January 2023

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Journal articles on the topic "Potentiodynamic polarization measurement"

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Saunders, Ivan. "Facilitating potentiodynamic anodic polarization measurement in corrosion testing." Anti-Corrosion Methods and Materials 43, no. 3 (March 1996): 21–25. http://dx.doi.org/10.1108/eb007393.

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Zhou, Hu, and Janine Mauzeroll. "Using High Field Model to Interpret Potentiodynamic Polarization Curves of AA7075 at High Scan Rates." ECS Meeting Abstracts MA2022-01, no. 16 (July 7, 2022): 1001. http://dx.doi.org/10.1149/ma2022-01161001mtgabs.

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The drastic distortion of potentiodynamic polarization curves measured at high potential scan rates prevents the extraction of accurate kinetic parameters. By measuring potentiodynamic polarization curves of AA7075 at scan rates ranging from 0.167 mV/s to 100 mV/s, in an acidic solution of 0.62 M NaH2PO4 and a near-neutral 3.5 wt% NaCl solution, changes in potentiodynamic polarization curves are observed not only at different scan rates and electrolytes but also between replicated experiments. Contrary to what was reported in previous studies, the disturbance of charging current associated with high scan rates does not satisfactorily explain the potentiodynamic polarization shape. Instead, the high field model that incorporates the kinetics of anodic oxide growth successfully captures the features of experimental potentiodynamic polarization curves. Compared to Tafel’s theory, the high field model explains remarkably both the changing kinetics with scan rates, electrolytes, and the variance between the measurement performed at different sites. Figure 1
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Nofrizal, Nofrizal. "Gambir Extract As A Corrosion Inhibitor For Mild Steel In Acidic Solution." Scientific Contributions Oil and Gas 35, no. 3 (March 10, 2022): 139–45. http://dx.doi.org/10.29017/scog.35.3.786.

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The inhibition infl uence of Gambir extract in 1M Hidrocloric Medium on corrosion of mild steel in acidic solution was studied by weight loss measurements, potentiodynamic polarization, electrochemical impedance spectroscopy (EIS) and scanning electron microscope (SEM method. It is believed that the phenolic compounds that contained in the Gambir extract in 1 M Hidrocloric medium to be responsible for the inhibition. The corrosion studies shows that Gambir extract gives an anodic type of inhibition and best at the concentration of 150 ppm. The inhibition effi ciency for weight loss measurement, potentiodynamic polarization measurement, and electrochemical impedance spectroscopy were 76.52, 88.28 and 66.27% respectively. SEM analysis shows that the morphology of inhibited mild steel was improved compared with uninhibited mild steel.
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Liu, Yun, Zhi Dang, Yin Xu, and Tianyuan Xu. "Pyrite Passivation by Triethylenetetramine: An Electrochemical Study." Journal of Analytical Methods in Chemistry 2013 (2013): 1–8. http://dx.doi.org/10.1155/2013/387124.

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The potential of triethylenetetramine (TETA) to inhibit the oxidation of pyrite in H2SO4solution had been investigated by using the open-circuit potential (OCP), cyclic voltammetry (CV), potentiodynamic polarization, and electrochemical impedance (EIS), respectively. Experimental results indicate that TETA is an efficient coating agent in preventing the oxidation of pyrite and that the inhibition efficiency is more pronounced with the increase of TETA. The data from potentiodynamic polarization show that the inhibition efficiency (η%) increases from 42.08% to 80.98% with the concentration of TETA increasing from 1% to 5%. These results are consistent with the measurement of EIS (43.09% to 82.55%). The information obtained from potentiodynamic polarization also displays that the TETA is a kind of mixed type inhibitor.
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Li, Song Song, Wei He, Zhi Hua Tao, and Shou Xu Wang. "Electrochemical Investigation of Triadimenol as Corrosion Inhibitor for Copper in 0.5mol/L H2SO4 Solution." Advanced Materials Research 830 (October 2013): 81–85. http://dx.doi.org/10.4028/www.scientific.net/amr.830.81.

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This paper chose triadimenol as a corrosion inhibitor of copper in 0.5mol/L sulfuric acid. The properties of corrosion inhibition were investigated by the polarization measurement and electrochemical impedance spectroscopy (EIS). Polarization curves showed that both cathodic and anodic processes of copper corrosion were suppressed. The inhibiting efficiency increased as the increment of the inhibitor concentration and reached 86.7% at 50 mg/L. The results obtained from EIS measurements are in line with that obtained from potentiodynamic polarization. Finally, a mechanism of inhibition is proposed and discussed.
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Sebastian, Divine, Chun-Wei Yao, Lutfun Nipa, Ian Lian, and Gary Twu. "Corrosion Behavior and Mechanical Properties of a Nanocomposite Superhydrophobic Coating." Coatings 11, no. 6 (May 29, 2021): 652. http://dx.doi.org/10.3390/coatings11060652.

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In this work, a mechanically durable anticorrosion superhydrophobic coating is developed using a nanocomposite coating solution composed of silica nanoparticles and epoxy resin. The nanocomposite coating developed was tested for its superhydrophobic behavior using goniometry; surface morphology using scanning electron microscopy and atomic force microscopy; elemental composition using energy dispersive X-ray spectroscopy; corrosion resistance using atomic force microscopy; and potentiodynamic polarization measurements. The nanocomposite coating possesses hierarchical micro/nanostructures, according to the scanning electron microscopy images, and the presence of such structures was further confirmed by the atomic force microscopy images. The developed nanocomposite coating was found to be highly superhydrophobic as well as corrosion resistant, according to the results from static contact angle measurement and potentiodynamic polarization measurement, respectively. The abrasion resistance and mechanical durability of the nanocomposite coating were studied by abrasion tests, and the mechanical properties such as reduced modulus and Berkovich hardness were evaluated with the aid of nanoindentation tests.
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Liang, Xiao Feng, and Xue Yang. "Corrosion Inhibition of 2-Mercaptobenzothiazole for Carbon Steel in Sulfuric Acid Solution." Advanced Materials Research 557-559 (July 2012): 92–95. http://dx.doi.org/10.4028/www.scientific.net/amr.557-559.92.

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The inhibition effect of 2-Mercaptobenzothiazole (2-MB) against the corrosion of carbon steel in sulfuric acid solution was studied by weight loss measurement and electrochemical measurements(potentiodynamic polarization techniques). The results show that 2-MB acts as a good corrosion inhibitor in sulfuric acid solution. Adsorption of 2-MB is found to obey Langmuir isotherm. Polarization curves indicate 2-MB is a mixed-type inhibitor. The effects of temperature and sulfuric acid concentration were also studied.
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Parajuli, Davilal, Srijana Sharma, Hari Bhakta Oli, Dilip Singh Bohara, Deval Prasad Bhattarai, Arjun Prasad Tiwari, and Amar Prasad Yadav. "Comparative Study of Corrosion Inhibition Efficacy of Alkaloid Extract of Artemesia vulgaris and Solanum tuberosum in Mild Steel Samples in 1 M Sulphuric Acid." Electrochem 3, no. 3 (July 29, 2022): 416–33. http://dx.doi.org/10.3390/electrochem3030029.

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Two different types of alkaloids are successfully extracted from two plants Artemisia vulgaris (AV) and Solanum tuberosum (ST) in the laboratory and used as corrosion inhibitors for mild steel samples. The corrosion inhibition potential of these alkaloids is determined by weight loss and potentiodynamic polarization measurement methods. Based on the weight loss measurement study of a sample immersed for 6 h in 1000 ppm inhibitor solution of AV and ST alkaloids, the corrosion inhibition efficiency is found to be 92.58% and 90.79%, respectively. The potentiodynamic polarization measurement shows 88.06% and 83.22% corrosion inhibition efficiency for AV and ST alkaloids, respectively, for the sample immersed for 1 h in 1000 ppm inhibitor solution. These promising efficiency and suitable immersion time effect can lead to the development of good green inhibitors.
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Moghanni-Bavil-Olyaei, Hamed, and Jalal Arjomandi. "Enhanced electrochemical performance of Al–0.9Mg–1Zn–0.1Mn–0.05Bi–0.02In fabricated from commercially pure aluminum for use as the anode of alkaline batteries." RSC Advances 6, no. 33 (2016): 28055–62. http://dx.doi.org/10.1039/c6ra02113a.

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The electrochemical performance of Al–0.9Mg–1Zn–0.1Mn–0.05Bi–0.02In (wt%) from commercially pure aluminum has been determined using open circuit potential–time measurement, galvanostatic discharge, potentiodynamic polarization and electrochemical impedance spectroscopy.
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Vrsalović, Ladislav, Emeka Emmanuel Oguzie, Mirko Gojić, Stjepan Kožuh, Ivana Ivanić, Lana Terzić, and Senka Gudić. "Intergranular Corrosion of Cu-Al-Ni Alloy in 0.5 mol dm−3 H2SO4 Solution." Kemija u industriji 69, no. 9-10 (2020): 457–64. http://dx.doi.org/10.15255/kui.2020.022.

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The corrosion behaviour of Cu-Al-Ni alloy in 0.5 mol dm–3 H2SO4 solution was investigated by electrochemical methods including open circuit potential measurement, electrochemical impedance spectroscopy measurements, linear and potentiodynamic polarization. Measurements were performed in 0.5 mol dm–3 H2SO4 at temperatures 20 and 40 °C. After polarization testing, corroded electrode surfaces were ultrasonically cleaned in deionized water and examined by light and scanning electron microscopy, while the elemental composition at individual points of the alloy surface was determined by EDS analysis. The results of the investigations revealed the occurrence of intergranular corrosion on the Cu-Al-Ni surface, which became more pronounced with increasing temperature.
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Book chapters on the topic "Potentiodynamic polarization measurement"

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Masmoudi, Mohamed. "Infrared Characterization and Electrochemical Study of Silanes Grafted into Surface of Copper." In Thin Films [Working Title]. IntechOpen, 2021. http://dx.doi.org/10.5772/intechopen.99782.

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The formation of a protective layer of tow silane coupling agents: γ -methacryloxypropyltrimethoxysilane (γ-MPS) or γ-aminopropyltriethoxysilane (γ-APS) on copper is studied by diffuse reflectance infrared spectroscopy (DRIFT), electrochemical (Potentiodynamic polarization) and gravimetric chemical (Weight loss) measurements. Dried in ambient conditions, the silane adsorbed on the copper subtract physically, however its protective action is not reliable. Thiolate and siloxane band formation ameliorate the protective action of the silanic layer on the surface of copper especially after curing process. Potentiodynamic polarization and Weight loss experiments show that the performances protective action of cured treatment (cured/Cu-silane) is higher than that of aging process (aged/Cu-silane).
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Tao, Shaohu, Jianping Peng, Yuezhong Di, Kejia Liu, Kun Zhao, and Naixiang Feng. "Electrochemical Study of Potassium Fluoride in a Cryolite-Aluminum Oxide Molten Salt." In Encyclopedia of Aluminum and Its Alloys. Boca Raton: CRC Press, 2019. http://dx.doi.org/10.1201/9781351045636-140000409.

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Selective and efficient electrochemical methods to characterize aluminum are necessary. Current methods are based on potentiodynamic polarization, recurrent potential double pulses, chronopotentiometry, open-circuit chronopotentiometry, and potentiostatic electrolysis, but have not been used to characterize the deposition of aluminum in Na3AlF6-Al2O3-KF molten salts. The control processes of the formation of aluminum-tungsten inter-metallic compounds, and the deposition of aluminum have been investigated by using steady-state potentiodynamic cathodic polarization curves. The dissolution loss rate of aluminum was determined with an increase in KF concentration by the analysis of recurrent potential double pulses. Using chronopotentiometry, it was confirmed that the deposition potential of aluminum shifted more negative as the KF concentration increased, and a higher KF concentrations induced a higher cathodic overpotential. From open-circuit potential measurements and scanning electron micrographs, it was concluded that aluminum(III) ions react with tungsten substrates to form an aluminum-tungsten compound, and the reaction mechanism of aluminum was determined. These electrochemical methods applied with aluminum electrolysis were accurate, efficient, and reliable.
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Ouakki, Moussa, Mouhsine Galai, Mohammed Cherkaoui, Mohamed Ebn Touhami, E. H. Rifi, and Z. Hatim. "Corrosion Inhibition Study of Mild Steel in the Acidic Mediums Containing a Mineral Compound-Based Phosphate." In New Challenges and Industrial Applications for Corrosion Prevention and Control, 187–206. IGI Global, 2020. http://dx.doi.org/10.4018/978-1-7998-2775-7.ch008.

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The corrosion inhibition of mild steel in hydrochloric, sulfuric, and phosphoric acids solutions containing a mineral compound-based phosphate (apatite) was evaluated by potentiodynamic polarization and electrochemical impedance spectroscopy. Potentio-dynamic polarization measurements reveal that the inhibition efficiency increased with the concentration of the apatite, which appears to be a cathodic type inhibitor in the three mediums. Electrochemical impedance spectroscopy confirms this result; indeed, the transfer resistance increases with apatite concentration. The authors note that the double layer capacitance decreases simultaneously suggesting the formation of an adsorbed layer on the mild steel surface. The inhibition mechanism has been elucidated by a thermodynamic study, which showed that the film was formed by physi-sorption. The adsorption model obeys to the Langmuir adsorption isotherm. The parameters of activation energy were evaluated and discussed.
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Hanini, Karima, Sameh Boudiba, and Merzoug Benahmed. "Reducing Emerging Contaminants Ensuing from Rusting of Marine Steel Installations." In Emerging Contaminants. IntechOpen, 2021. http://dx.doi.org/10.5772/intechopen.95493.

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Marine steel installations are usually subject to biocorrosion due to their immersing in seawater. Biocorrosion-causing microorganisms, such as bacteria and fungi, often form biofilms on materials, inducing chemical changes in these materials and in the surrounding liquid medium. The formed biofilms resulting from this phenomenon are considered as emerging contaminants. In this work, in addition to the realization of the electrodeposition of zinc on a steel in chloride bath with various concentrations of Taxus baccata extracts as additives using a direct courant supply, the study of the corrosion of the obtained substrates was performed in seawater as an aggressive environment. The efficiency against corrosion was evaluated by potentiodynamic polarizations and weight loss measurements. The coated surface morphology was analyzed using brightness meter, thickness meter and adhesion tests. The experimental results showed that all tested extracts performed the quality of the zinc deposits and their efficiency against corrosion indicating that coated samples in the presence of the extracts were more resistant minimizing the emerging contaminants in seawater.
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Conference papers on the topic "Potentiodynamic polarization measurement"

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Jung, Soyoung, and Thomas M. Devine. "Electrochemical Tests of Corrosion of Magnetic Hard Disks With Overcoats of DLC." In STLE/ASME 2003 International Joint Tribology Conference. ASMEDC, 2003. http://dx.doi.org/10.1115/2003-trib-336.

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Two electrochemical techniques were used to investigate the corrosion of DLC coated magnetic hard disks: (1) potentiodynamic and potentiostatic anodic polarization and (2) electrochemical impedance spectroscopy. The objective was to determine the ability of DC polarization and AC polarization to detect the presence of porosity in the DLC. The results indicate that anodic polarization at high potentials (≈ +1.0V vs SCE) to cause pitting corrosion of the metal layers underneath the DLC might provide a rapid and quantitative estimate of the amount of porosity in the DLC. Measurement of the low frequency electrochemical impedance at intermediate potentials (≈ +0.5V vs SCE) appears to indicate the presence of porosity but further work is required to establish a quantitative relationship between the amount of porosity and the value of the low frequency impedance.
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Bahgat, Ahmed, Paul Okonkwo, Gupta Manoj, Noora Alqahtani, Rana Shakoor, and Aboubakr Abdullah. "Study of the In Vitro Biodegradation Behavior of Mg–2.5Zn–xES Composite for Orthopedic Application." In Qatar University Annual Research Forum & Exhibition. Qatar University Press, 2021. http://dx.doi.org/10.29117/quarfe.2021.0097.

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Non-degradable steel and titanium implants used to replace defects of the locomotor system or fabricate vascular stents provide maximum stability but have too many drawbacks. However; the defects in oxide layer and the corrosive nature of physiological environment, the thermodynamic tendencies make the alloys susceptible to release of cationic species in the form of corrosion, which result in triggering various biological factors and compromises the mechanical integrity of the implanted materials. Currently, biodegradable magnesium alloys are considered as promising materials for creation of fixation devices in orthopedics and cardiovascular surgery. In this work, zinc (Zn) and eggshell (ES) reinforced biodegradable magnesium alloy (Mg–2.5Zn), and environment concise (eco) composite (Mg–2.5Zn–xES) was fabricated using disintegrated melt deposition (DMD) technique. In vitro experiments were conducted to explore the effect variable concentration of ES ( 3 and 7 wt%) on the biodegradation behavior of Mg–Zn alloy using simulated body fluid (SBF) at 37 ℃. The corrosion behavior of the Mg–2.5Zn–xES alloys was explored in SBF solution using different techniques such as weight loss measurement, hydrogen evolution, potentiodynamic polarization, electrochemical Impedance Spectroscopy (EIS). EIS revealed increased in vitro degradation of the biodegradable magnesium alloy, and ecofriendly composite as the percentage of ES reinforcement was increased. X-ray diffraction (XRD) was performed to observe the chemical composition of elements and reaction products present in the degraded samples after the corrosion process.
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Yamoah, Nana Kwame, Timothy Moses, and Dhananjay Kumar. "Corrosion Behavior of Tricalcium Phosphate Doped With Different Compositions of Silver." In ASME 2015 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2015. http://dx.doi.org/10.1115/imece2015-51748.

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In this study, magnesium (Mg) disks were coated with β-tricalcium phosphate (β-TCP) doped with different mass percent of silver (Ag) (0 wt%, 1 wt%, 5 wt% and 10 wt%) in an effort to modulate the detrimental osteoimmunomodulatory properties and colonization of bacteria on Mg disk, due to the reported favorable osteoimmunomodulatory properties of β-TCP and antibacterial properties of Ag. This paper describes the growth, characterization and corrosion analyses of β-TCP doped with different compositions of Ag thin film coatings. The phase composition and microstructure analyses were performed using X-ray diffraction (XRD) and scanning electron microscopy (SEM) respectively. The SEM images showed that varying the percentage of Ag dopant affects the surface morphology of the β-TCP coatings. The corrosion protection behavior of the coated samples were evaluated using electrochemical measurement techniques, such as potentiodynamic polarization (PD) and electrochemical impedance spectroscopy (EIS). The corrosion tests were performed in Hank’s Balanced salt solution using a three-electrode electrochemical cell. The results showed that the β-TCP coating and β-TCP doped with Ag coatings on the Mg disks exhibit a much superior stability and lower corrosion rate compared to bare Mg. It was observed that increasing the mass of the Ag dopant increases the corrosion protection, but 10 wt% Ag doping in β-TCP reduces the corrosion protection behavior. The SEM images of the samples after corrosion show that the β-TCP and β-TCP doped with 10 wt% Ag suffered the most corrosion attack compare to β-TCP doped with 1 wt% and 5 wt% Ag. In conclusion, we have developed β-TCP and β-TCP doped with 1 wt%, 5 wt% and 10 wt% Ag coating with tunable corrosion protection efficiency above 88%.
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Vernhes, L., M. Azzi, E. Bousser, and J. E. Klemberg-Sapieha. "Hybrid Co-Cr/W-WC and Ni-W-Cr-B/W-WC Coating Systems." In ITSC2015, edited by A. Agarwal, G. Bolelli, A. Concustell, Y. C. Lau, A. McDonald, F. L. Toma, E. Turunen, and C. A. Widener. ASM International, 2015. http://dx.doi.org/10.31399/asm.cp.itsc2015p1031.

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Abstract The mechanical, tribological, and corrosion properties of two hybrid coating systems were assessed: 1) a tungsten–tungsten carbide (W-WC) top layer and a laser cladded cobalt– chromium (Co-Cr) interlayer (Stellite 6 superalloy) applied to a 316 stainless steel substrate; and 2) the same W-WC top layer and an HVOF spray-and-fused Ni-W-Cr-B interlayer (Colmonoy 88 superalloy) applied to an Inconel 718 substrate. X-ray diffraction, energy dispersive spectroscopy, and scanning electron microscopy were used to analyze the microstructure of the coating layers. Microindentation was used to measure surface hardness and the hardness profile of the coating systems. Rockwell indentation was used to assess coating adhesion according to CEN/TS 1071-8. Surface load-carrying capacity was also assessed by measuring micro- and macrohardness at high loads. Tribological properties were assessed with a linear reciprocating ball-on-flat sliding wear test, and corrosion resistance was measured by potentiodynamic polarization and electrochemical impedance spectroscopy. W-WC layers showed class I adhesion to both the SS 316 and Inconel 718 substrates, with and without an interlayer. Hardness profile measurements on cross section showed hardness of 13.6 GPa and 7.0 GPa for W-WC and Co-Cr, respectively, with average hardness of 9.7 GPa for Ni-W-Cr-B. Furthermore, hardness measurements at different high loads revealed that the addition of an interlayer increases surface hardness by up to 200% compared to the same coating system provided without an interlayer, quantifying the additional loadcarrying capacity provided by the supplementary interlayer. The tribological measurements show that, except for the Inconel 718 / Ni-W-Cr-B / W-WC system, the hardest interlayer or substrate leads to the highest wear rates. In addition, the W-WC layer showed excellent corrosion protection, with no pitting observed after potentiodynamic polarization testing.
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Xiong, T., Y. Tao, C. Sun, H. Jin, H. Du, and T. Li. "Study on Corrosion Behavior of Cold Sprayed Al-αAl2O3 Deposit on AZ91D Alloy." In ITSC2009, edited by B. R. Marple, M. M. Hyland, Y. C. Lau, C. J. Li, R. S. Lima, and G. Montavon. ASM International, 2009. http://dx.doi.org/10.31399/asm.cp.itsc2009p0669.

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Abstract A composite coating using mixed powders of pure Al and α-Al2O3 as feedstock was deposited on AZ91D alloy substrate by cold spraying. The content of α-Al2O3 in mixed powders was 50wt%. Electrochemical experiments were carried out using 3.5wt.% NaCl solution as electrolyte. Because of dense structure, the composite coating could separate substrate from electrolyte thoroughly for long time immersion. The corrosion behavior of the composite coating was evaluated by using electrochemical impedance spectroscopy (EIS) and potentiodynamic polarization measurements. It is found that the composite coating presented much better corrosion resistance than bare AZ91D alloy, even than bulk 1050 aluminum by electrochemical studies in 3.5wt.% NaCl solution.
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Pukasiewicz, Anderson G. M., André R. Mayer, Kaue Bertuol, Irene B. A. F. Siqueira, Rodolpho F. Vaz, Andre R. Capra, and M. J. de Souza. "Evaluation of Cavitation and Corrosion Synergism Mechanism on Cr3C2-25NiCr Coatings Deposited by HVOF Process." In ITSC2019, edited by F. Azarmi, K. Balani, H. Koivuluoto, Y. Lau, H. Li, K. Shinoda, F. Toma, J. Veilleux, and C. Widener. ASM International, 2019. http://dx.doi.org/10.31399/asm.cp.itsc2019p0352.

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Abstract This study investigates the synergistic effects of cavitation and corrosion on Cr3C2-25NiCr coatings with different levels of porosity. The coatings are deposited by HVOF spraying and evaluated based on SEM analysis, Vickers microhardness, potentiodynamic polarization measurements, and cavitation erosion tests in various environments under ultrasonic vibration. The results show that higher porosity reduces both cavitation and corrosion resistance, as expected. However, the samples did not show significant alteration of their cavitation properties in NaCl, probably because of the high corrosion resistance of the different phases in the coating. The influence of HVOF fuel-oxygen ratio and total gas flow on coating porosity, as well as phase morphology, is also discussed.
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Wang, Yonggang, Xin Liu, and Liang Sun. "Study on the Bonding Strength and Corrosion Resistance of Low-Pressure Cold Sprayed Al/Al2O3 Composite Coatings on Pressure Vessel Steel Substrate." In ASME 2022 Pressure Vessels & Piping Conference. American Society of Mechanical Engineers, 2022. http://dx.doi.org/10.1115/pvp2022-84489.

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Abstract Due to the complex working environment, the defects were easily produced on the surface of pressure vessel plate, such as scratch, wear and corrosion pit, which reduced the service life of equipment. As a new surface coating preparation technology, cold spraying technology can be used to effectively repair and protect the substrate. With the development of cold spraying technology, more and more metal powders are used to prepare functional coatings, but aluminum powders are used most frequently due to significant plasticity and corrosion resistance. However, pure aluminum coating have a obvious shortcoming with lower bonding strength, and most of bonding strength values of coatings and steels are about 14.6 MPa. With the aim to improve the mechanical properties more of pure Al, the most representative one is the inclusion of ceramic particles as reinforcement to produce dense coatings. Thus, the Al-Al2O3 composite coatings of the different Al2O3 weight fractions were deposited on the surface of pressure vessel plate by cold spraying technology. The strength and corrosion resistance of the coatings were evaluated by tensile test, corrosion weight loss measurement and electrochemical test. The results show that the bonding strength of pure Al coating is the lowest among the four cold spray coatings, and the bonding strength sharply increases while the coating increased Al2O3 particles, and the largest values with bonding strength of Al-Al2O3 is as high as 45.4 MPa. The tensile test was carried out under the allowable stress of pressure vessel. Observations under optical microscope (OM) were also done, and the coating has excellent quality and no new cracks and holes. The corrosion weight-loss of the substrate and composite coatings were measured, and the corrosion weight loss rate of Al-Al2O3 was 5 times lower than that of pressure vessel plate. In addition, for all the coatings, the values of weight loss had little changes. It is observed that the values of the composite coating was exhibited a peak with an increasing of the Al2O3 content. The Al-20wt.%Al2O3 was shown the best corrosion resistance and the value of weight loss was 0.11(g/cm2*h), which probably was attributed to the effect of the lower porosity. Potentiodynamic polarization curves were shown the corrosion current density of composite coatings were one order of magnitude lower than that of the substrate. Therefore, we concluded that the corrosion resistance is obviously better than that of the substrate, which can effectively protect the substrate and delay the service life of the pressure vessel plate.
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Liu, Y., Z. X. Zhu, J. Ma, B. S. Xu, S. N. Ma, and Z. X. Li. "Effects of Rare-Earth Metal on Microstructure and Corrosion Resistance of Arc-Sprayed Zn-Al-Mg Coating." In ITSC2005, edited by E. Lugscheider. Verlag für Schweißen und verwandte Verfahren DVS-Verlag GmbH, 2005. http://dx.doi.org/10.31399/asm.cp.itsc2005p1468.

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Abstract Cored wires and high velocity arc spraying technique (HVAS) were applied to produce Zn-Al-Mg and Zn-Al-Mg-Re alloy coatings on low carbon steel substrates. And the effects of rare-earth metal on microstructure and corrosion resistance of the Zn-Al-Mg coating were investigated. The microstructures and mechanical properties were studied by SEM, EDS and XRD. The coatings show a typical aspect of layered thermal sprayed material structure. SEM results revealed that the addition of small amount of REM to the cored wires would result in a fine grained structure in the coating layer together with a dense microstructure, which is the reason for the adhesion strength enhancement and the porosity reducing of the coating. And the electrochemical corrosion mechanisms of the coatings were discussed. Chemical analysis of the coating indicated the composition to be Zn-16.5Al-5.9Mg-4.6O-RE (wt%). The phases of the coatings are Zn, Al5Mg11Zn4, MgZn2 and Al3Mg2 mainly, together with oxide ZnO, ZnAl2O4, and MgAl2O4. The electrochemical corrosion behaviors of Zn-Al-Mg-RE coating were investigated in 5%NaCl solution comparing with Zn-Al-Mg coating. Electrochemical measurements in the forms of potential-time and potentiodynamic polarization tests showed that such two coatings behaved excellent electrochemical corrosion resistance in salt solution, and the Zn-Al-Mg-RE coating was much more stable. Electrochemical impedance spectroscopy (EIS) results revealed that small amount of rare-earth metal can not promote to form the passive film but it could enhance the surface property of the coating extraordinarily, which will has a great effect on the corrosion behaviors of the coating. Keywords: Zn-Al-Mg-RE coating; high velocity arc spraying; cored wires; potentiodynamic polarization; electrochemical impedance spectroscopy
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Tang, X., L. Y. Xu, and Y. Frank Cheng. "A Fundamental Understanding of Erosion-Corrosion of Hydrotransport Pipes in Oil Sands Slurry." In 2008 7th International Pipeline Conference. ASMEDC, 2008. http://dx.doi.org/10.1115/ipc2008-64144.

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Erosion-corrosion (E-C) of X-65 pipe steel was investigated in a simulated oil sand slurry through an impingement jet system. Measurements of weight-loss and potentiodynamic polarization curves combined with optical microscopy observation were performed to determine the synergism of corrosion and erosion in E-C of steel. It was found that passivity of the steel developed in static oil-water emulsion cannot be maintained in the flowing fluid due to the enhanced activity of the steel upon impingement of the emulsion/slurry. The effect of slurry impact angle on E-C of steel is complex, depending on the magnitude and synergism of shear stress and normal stress exerting on the electrode surface. There is a synergism of corrosion and erosion in E-C of steel. The contributions of corrosion and erosion to E-C rate of the steel in oil sand slurry rank approximately 30% and 70%, respectively. Erosion dominates the E-C of X-65 steel in oil sand slurry.
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Schiefler, M. F. O., F. Gärtner, J. Voyer, A. Kirsten, H. Kreye, and A. J. A. Buschinelli. "Protection of Steel Components Against Marine Corrosion by Thermally Sprayed Anodic Coatings." In ITSC2003, edited by Basil R. Marple and Christian Moreau. ASM International, 2003. http://dx.doi.org/10.31399/asm.cp.itsc2003p0361.

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Abstract:
Abstract It is well known that thermally sprayed aluminum and aluminum alloys can be used to protect low-alloyed steel against marine corrosion in offshore applications. The efficiency and service life of this protection can be, however, severely limited by the amount and distribution of defects, which are usually present in coating microstructures. In thermal spraying, microstructures and properties are strongly influenced by the type of spray system used for the production of coatings. To investigate the influence of defects like pores, oxides and cracks on the corrosion performance, coatings were processed by conventional thermal spray techniques, such as Flame Spraying (FS) and Arc Spraying (AS). In addition, the more recently introduced High Velocity Combustion Wire (HVCW) spraying technique was used, which, due to higher particle velocities, results in lower porosity and finer coating microstructures as compared to conventional processes. The influence of spray conditions and related microstructures on the performance in corrosion tests was investigated for protective coatings of Al99.5, AlMg5 and Al - 30 wt. % W2C. The resistance against corrosion was analyzed by different electrochemical methods, such as corrosion potential monitoring, polarization resistance and potentiodynamic anodic polarization measurements. Additionally, the microstructures of the coatings were examined before and after the electrochemical tests. The results from these tests are correlated and attributed to the different microstructures obtained by the various spray techniques and different compositions of the feedstock material.
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