Effect of ultra accurate control of electrolyte temperature on the performance of micro arc oxidation ceramic coatings |
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| Affiliation: | 1. Group of Mechanical and Biomedical Engineering, College of Mechanical & Electronic Engineering, Xi''an Polytechnic University, Xi''an, Shaanxi, 710048, PR China;2. State Key Laboratory of Solid Lubrication, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou, 730000, China;3. Zhejiang Linix Motor CO., LTD, Hengdian Movie Zone, Dongyang, Zhejiang, 322118, PR China;1. Key Laboratory for Ecological Metallurgy of Multimetallic Mineral (Ministry of Education), Northeastern University, Shenyang, 110819, China;2. Faculty of Materials Metallurgy and Chemistry, Jiangxi University of Science and Technology, Ganzhou, 341000, China;3. Institute of Inorganic Chemistry, Slovak Academy of Sciences, Dúbravskia cesta 9, SK-84536, Bratislava, Slovakia;1. Research Institute of Interdisciplinary Science & School of Materials Science and Engineering, Dongguan Unieversity of Technology, Dongguan, 523808, China;2. State Key Laboratory of Solid Lubrication, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou, 730000, China;1. College of Materials Science and Engineering, Nanjing Tech University, Nanjing, 211816, China;2. School of Physics Science and Information Technology, Liaocheng University, Liaocheng, 252000, China;3. Xiamen Branch of Luoyang Ship Material Research Institute, Fujian, Xiamen, 361106, China;1. Institute for Advanced Ceramics, Harbin Institute of Technology, Harbin, 150080, China;2. Key Laboratory of Advanced Structure-Function Integrated Materials and Green Manufacturing Technology, Harbin Institute of Technology, Harbin, 150001, China;3. Center of Analysis Measurement and Computing, Harbin Institute of Technology, Harbin, China |
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| Abstract: | The technique of micro arc oxidation (MAO) uses arc discharge and high-voltage breakdown to produce a ceramic layer on valve metal surfaces. However, the common method of MAO requires immersing the workpiece in an electrolyte solution, which can result in elevated temperatures due to the arc discharge, thus negatively affecting the coating's quality and performance. This article investigates the influence of electrolyte temperature on the performance of MAO ceramic coatings, with the assistance of a robotic arm enabling valve metal reaction without immersion in the electrolyte, and precise control of electrolyte temperature through a MAO temperature monitoring system. Various techniques, such as scanning electron microscopy (SEM), hardness testing, electrochemical corrosion experiments, and friction-wear experiments, were utilized to characterize the performance of the prepared coating. The results indicate a nonlinear correlation between the temperature of the electrolyte and the thickness and hardness of the ceramic coating. The corrosion and wear resistance of the MAO ceramic coatings initially improve with increasing electrolyte temperature but eventually deteriorate. At an electrolyte temperature of 40 °C, the MAO ceramic coating exhibits the optimal corrosion and wear resistance. The variation in electrolyte temperature affects the reactivity of the electrolyte ions, leading to changes in the morphology and properties of the resulting MAO ceramic coating. These findings offer valuable insights into the interaction mechanism between electrolyte temperature and the properties of the resulting MAO ceramic coating. This is of great significance in optimizing the MAO process for specific applications and improving the overall performance of ceramic coatings. |
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| Keywords: | Micro arc oxidation (MAO) Electrolyte temperature Ceramic coating Wear and corrosion resistance |
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