Structure and Corrosion Resistance of Microarc Oxidation Coatings on AZ91D Magnesium Alloy
来源期刊：JOURNAL OF RARE EARTHS2004年增刊第2期
论文作者：Li Weijing Han Jianmin CUI Shihai Zhu Xiaowen Wang Jinhua LI Ronghua
Key words：magnesium alloy; micro-arc oxidation; microstructure; corrosion resistance; adhesive;
Abstract: Magnesium alloys are widely used as shells of 3C (computer, mobile phone and consumer electronics) equipments for its impressive mechanical and physical properties, such as low density, good resistance to electromagnetic radiation, suitable for high pressure diecasting and easily recycling, etc. But poor corrosion resistance confines its extensively application. In this paper, protective coatings was successfully prepared on AZ91D magnesium alloys by micro-arc oxidation (MAO) and painting process. Microstructures and phases of MAO coatings were invesgated with scanning electron microscope (SEM) and X-Ray diffractometer. Mechanical properties of MAO coating, such as adhesive force and corrosion resistance, were also tested. Results showed that MAO coatings were a good base for painting process. MAO coatings with paint have good adhesive properties to base metal and excellent corrosion resistance. Micro-arc oxidation with painting process is a good kind of surface treatment to improve the corrosion resistance of mobile phone shell made of AZ91D magnesium alloys.
Li Weijing1，Han Jianmin1，CUI Shihai1，Zhu Xiaowen1，Wang Jinhua1，LI Ronghua1
(1.School of Mechanical,Electronic and Control Engineering,Beijing Jiaotong University,Beijing 100044,China)
Abstract:Magnesium alloys are widely used as shells of 3C (computer, mobile phone and consumer electronics) equipments for its impressive mechanical and physical properties, such as low density, good resistance to electromagnetic radiation, suitable for high pressure diecasting and easily recycling, etc. But poor corrosion resistance confines its extensively application. In this paper, protective coatings was successfully prepared on AZ91D magnesium alloys by micro-arc oxidation (MAO) and painting process. Microstructures and phases of MAO coatings were invesgated with scanning electron microscope (SEM) and X-Ray diffractometer. Mechanical properties of MAO coating, such as adhesive force and corrosion resistance, were also tested. Results showed that MAO coatings were a good base for painting process. MAO coatings with paint have good adhesive properties to base metal and excellent corrosion resistance. Micro-arc oxidation with painting process is a good kind of surface treatment to improve the corrosion resistance of mobile phone shell made of AZ91D magnesium alloys.
Key words:magnesium alloy; micro-arc oxidation; microstructure; corrosion resistance; adhesive;
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