Growth and corrosion of aluminum PVD-coating on AZ31 magnesium alloy
Growth and corrosion of aluminum PVD-coating on AZ31 magnesium alloy
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DOI：
10.1016/j.matlet.2008.07.014
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发表时间：
2008-11
影响因子：
3
通讯作者：
Guosong Wu;X. Zeng;G. Yuan
中科院分区：
文献类型：
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作者：
Guosong Wu;X. Zeng;G. Yuan
采用磁控溅射技术在机械抛光AZ31镁合金表面制备了铝涂层。在抛光过程中，AZ31镁合金表面自发形成一层疏松的氧化膜。随后在该氧化层上沉积的铝涂层呈现出发达的柱状组织。在腐蚀试验中，由于Al涂层的阻挡作用，AZ31涂层的耐蚀性比未涂层的AZ31涂层要高。通常情况下，铝层是由镁合金衬底进行阴极保护。但有趣的是，由于碱化效应的发生，铝涂层仍然遭受着严重的腐蚀。
Magnetron sputtering was applied to prepare aluminum coating on a mechanically polished AZ31 magnesium alloy. A loose oxide film was spontaneously formed on the surface of AZ31 magnesium alloy during polishing process. The aluminum coating, which was subsequently deposited on this oxide layer, presented a developed columnar microstructure. Attributed to the barrier effect of Al coating, the Al coated AZ31 showed a higher corrosion resistance than bare AZ31 in corrosion tests. Generally, Al coating is cathodically protected by magnesium alloy substrate. But it is interesting in this study that Al coating still suffered from severe corrosion due to the occurrence of the alkalization effect.