Wear resistance of ceramic coating on AZ91 magnesium alloy by micro-arc oxidation

• Published in: Transactions of Nonferrous Metals Society of China Vol. 16; no. A03; pp. 1814 - 1818
• Main Author: 赵晖 刘正 陈立佳 陈吉 韩忠
• Format: Journal Article
• Language: English
• Published: College of Materials Science and Engineering, Shenyang University of Technology, Shenyang 110023, China 01.12.2006; College of Materials Science and Engineering, Shenyang Ligong University, Shenyang 110168, China%College of Materials Science and Engineering, Shenyang University of Technology, Shenyang 110023, China%Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China
• Subjects: 氧化行为; 磨损行为; 金属加工; 镁合金; 陶瓷涂层; AZ91 alloy; magnesium alloy; ceramic coating micro-arc oxidation; wear resistance
• ISSN: 1003-6326

The ceramic coating formed on AZ91 magnesium alloy by micro-arc oxidation （MAO） was characterized. The results show that the ceramic coating （3.4-23 μm in thickness）on the surface ofAZ91 alloy was attained under different micro-arc oxidation treatment conditions, which consist mainly of MgO, Mg2SiO4 and MgSiO3 phases. Nano-hardness in a cross-sectional specimen was determined by nano-indentation experiment. The MAO coatings exhibit higher hardness than the substrate. Dry sliding wear tests for the MAO coatings and AZ91 alloy were also carded out using an oscillating friction and wear tester in a ball-on-disc contact configuration. The wear resistance of the MAO coatings is improved respectively under different treatment time as a result of different structures of ceramic coatings formed on AZ91 alloy.