Acta Metall Sin  2011, Vol. 47 Issue (1): 74-80    DOI: 10.3724/SP.J.1037.2010.00330

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PREPARATION OF MICROARC OXIDATION COATING ON (Al2O3-SiO2)sf/AZ91D MAGNESIUM MATRIX COMPOSITE AND ITS ELECTROCHEMICAL IMPEDANCE SPECTROSCOPIC ANALYSIS\par

ZHU Qingzhen1,2), XUE Wenbin1,2), LU Liang1), DU Jiancheng1,2), LIU Guanjun3), LI Wenfang3)

1) Key Laboratory of 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 3) School of Materials Science and Engineering, South China University of Technology, Guangzhou 510640

ZHU Qingzhen XUE Wenbin LU Liang DU Jiancheng LIU Guanjun LI Wenfang. PREPARATION OF MICROARC OXIDATION COATING ON (Al₂O₃-SiO₂)_sf/AZ91D MAGNESIUM MATRIX COMPOSITE AND ITS ELECTROCHEMICAL IMPEDANCE SPECTROSCOPIC ANALYSIS\par. Acta Metall Sin, 2011, 47(1): 74-80.

Abstract References Related Articles Recommended Metrics Download:  PDF(1380KB)  Export:  BibTeX | EndNote (RIS)       Abstract  A thick protective ceramic coating on 33% (Al2O3-SiO2)sf/AZ91D (volume fraction) magnesium matrix composite was prepared by the microarc oxidation (MAO) technique in silicate electrolyte. SEM, EDS and XRD were employed to analyze the surface morphology, composition and phase constituent of the coating, furthermore, the microhardness profile of the coating was also measured. The electrochemical corrosion properties of magnesium matrix composite before and after the MAO surface treatment were evaluated by electrochemical impedance spectroscopy (EIS), and the equivalent circuits corresponding to different immersion times were suggested. The results show that the fiber-reinforced composite surface is completely covered by the MAO coating. The ceramic coating mainly consists of MgO and Mg2SiO4 phases. The maximum microhardness of coating is up to 1017 HV. The electrochemical impedance modulus, |Z|, of the coated magnesium matrix composite increases significantly compared with bare composite, thus the magnesium matrix composite coated by MAO displays a good corrosion resistance. The occurrence of inductive loop in EIS of coated composite after 96 h immersion in 3.5% NaCl solution implies the pitting deterioration in the coating. The corrosion resistance of coated magnesium matrix composite is determined by the properties of inner compact layer of MAO coating. Key words:  magnesium matrix composite      microarc oxidation coating      electrochemeical impedance spectroscopy (EIS)      Received:  08 July 2010      Fund:  Supported by National Natural Science Foundation of China (No.51071031) and Natural Science Foundation of Beijing (No.2102018) Service E-mail this article Add to citation manager E-mail Alert RSS （） Articles by authors ZHU Qiang-Zhen XUE Wen-Bin LV Liang DU Jian-Cheng LI Wen-Fang LIU Wan-Jun URL:  https://www.ams.org.cn/EN/10.3724/SP.J.1037.2010.00330     OR     https://www.ams.org.cn/EN/Y2011/V47/I1/74 [1] Tian J, Li W F, Han L F, Peng J H, Liu G. Mater Rev, 2009; 23(9): 71 (田君, 李文芳, 韩利发, 彭继华, 刘刚. 材料导报, 2009; 23(9): 71) [2] Liang J, Hu L T, Hao J C. Appl Surf Sci, 2007; 253: 6939 [3] Jiang B L, Zhang J M, Shi H Y. Chin J Nonferrous Met, 2004; 14: 539 (蒋百灵, 张菊梅, 时惠英. 中国有色金属学报, 2004; 14: 539) [4] Xue W B, Wu X L, Li X J, Tian H. J Alloys Compd, 2006; 425: 302 [5] Xue W B. 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