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| Preparation and Characterization of Alumina Coating on Stainless Steel by Cathodic Microarc Electrodeposition |
| XUE Wenbin1,2, JIN Qian1, DU Jiancheng1,2, HUA Ming1,2, WU Xiaoling1,2 |
1.Key Laboratory for Beam Technology and Materials Modification of Ministry of Education, College of Nuclear Science and Technology, Beijing Normal University, Beijing 100875
2.Beijing Radiation Center, Beijing 100875 |
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Cite this article:
XUE Wenbin JIN Qian DU Jiancheng HUA Ming WU Xiaoling. Preparation and Characterization of Alumina Coating on Stainless Steel by Cathodic Microarc Electrodeposition. Chin J Mater Res, 2012, 26(1): 21-25.
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Abstract An alumina coating of 80 μm thick was fabricated on the surface of 304 stainless steel by cathodic microarc electrodeposition in 0.4 mol/L Al(NO3)3 ethanol solution. The morphology, composition and phase constituent of the alumina coating were analyzed by scanning electron microscope (SEM) and X-ray diffraction (XRD), and the high-temperature oxidation and electrochemical corrosion behaviors of the coating were evaluated. The results show that the coating is composed of γ–Al2O3 and α–Al2O3 phases, and the coating contains a little Fe, Cr, Ni elements, which confirm that the stainless steel substrate near the coating/steel also takes part in the deposition and sintering process of alumina coating under cathodic microarc discharge. The oxidation rate of the coated stainless steel at 800 ℃ isothermal oxidation test is obviously reduced. Meanwhile, its corrosion potential increases positively and its corrosion current density decreases about one order of magnitude, indicating that the corrosion resistance is improved.
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Received: 27 October 2011
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| Fund: Supported by National Natural Science Foundation of China No.51071031, the Natural Science Foundation of Beijing No.2102018 and the Fundamental Research Funds for the Central Universities. |
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