摘要
对AZ91D镁合金进行微弧氧化处理,并在其基础上进行不同的后续表面处理,通过中性盐雾试验分析比较了几组表面处理结合方法对镁合金耐腐蚀性能的影响。结果表明:微弧氧化陶瓷层与电泳漆膜相结合的防护体系耐腐蚀性能最好。这与微弧氧化膜改善了镁合金表面的显微结构从而与有机涂层有良好的吸附和嵌合作用的特点有关。采用微弧氧化及合理的后续处理工艺完全可以满足高耐腐蚀性的要求。
Magnesium alloy AZ91D was surface-modified by micro-arc oxidation (MAO). Several organic coatings were then prepared on the micro-arc oxidation coating of the Mg alloy. The corrosion resistance of the dual-phase surface-modification coatings was evaluated using neutral salt spray test. It was found that the micro-arc oxidation coating in combination with organic coatings contributed to significantly increase the corrosion resistance of the Mg alloy, which could make it possible for the Mg alloy after the dualphase surface-modification to be used in severely corrosive working conditions. Specifically, the micro-arc oxidation coating combined with electrophoresis coating was the most effective in increasing the corrosion resistance of the Mg alloy. The reason could lie in that the micro-arc oxidation coating was able to refine the surface microstructure of the Mg alloy and hence considerably increase the adhesion strength of the organic coatings thereon.
出处
《材料保护》
CAS
CSCD
北大核心
2006年第9期15-17,共3页
Materials Protection
关键词
镁合金
微弧氧化
阳极电泳
盐雾腐蚀
涂装
magnesium alloy
micro-arc oxidation
anodic electrophoresis
coating
corrosion resistance
