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| GROWTH PROCESS AND CORROSION RESISTANCE OF CERAMIC COATINGS FORMED BY MICRO-ARC OXIDATION ON MAGNESIUM ALLOY |
| Bailing Jiang;Xianfeng Zhang |
| 西安理工大学材料科学与工程学院 |
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Abstract SEM and salt spray test were employed to characterize the surface morphology and corrosion resistance of ceramic coatings formed by micro-arc oxidation on magnesium alloy. The results show that the coating grows in the following steps, i.e., the stage of anodic deposition, micro-arc oxidation and local arc light. In the first stage of anodic deposition, the flocculent oxidation film deposits and extends on the surface of MB8 magnesium alloy. The next stage of micro-arc involves the decreasing and vanishing of flaw in the coatings, and the ceramic film formed is relatively uniform and dense, with very small micro-pores. However, in the last stage of local arc light, the relative large holes appear on the surface of the coatings, therefore, the ceramic film becomes looser. With increasing treated time, the corrosion resistance of the coatings increases, and is best at the treated time of 8～12 minute before it deteriorates.By controling the energy allocation of the different time and extending the time of uniform growth, the uniform and compaction ceramic coatings can be obtained.
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Received: 19 September 2003
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Corresponding Authors:
Bailing Jiang
E-mail: zhangxf_1020.student@sina.com
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