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采用热浸镀工艺在AZ91D镁合金化学镀Ni底层上获得了纯Sn镀层.采用SEM、XRD、盐雾试验和电化学动电位扫描极化曲线研究了镀层热处理前后镀层的组织及结构和耐腐蚀性能.结果表明,镁合金表面镀Sn具有优良的耐腐蚀性能,经72 h中性盐雾试验表面未被腐蚀,镀层自腐蚀电位相对于基体有较大的提高,腐蚀电流密度明显下降,镀层经220℃,1 h热处理后效果更加显著.
Pure Sn plating was obtained on the surface of AZ91D magnesium alloy electroless Ni plating by hot dip coating process.The microstructure and structure of the coating before and after heat treatment were studied by SEM, XRD, salt spray test and electrochemical kinetic potential scanning polarization curves The results show that the surface of magnesium alloy has excellent corrosion resistance. After 72 h neutral salt spray test, the surface is not corroded, the corrosion potential of the coating is greatly increased compared with that of the matrix, and the corrosion current density is obviously decreased. After 220 ℃, 1 h heat treatment effect is more significant.