在镁合金表面制备了化学镀镍-磷合金和脉冲电镀锌-镍合金组合镀层.采用扫描电镜、能谱仪考察了镁合金化学镀Ni-P合金和电镀锌-镍合金组合镀层的形貌和成分.结果表明,组合镀层表面均匀、致密、无明显缺陷.采用电化学测试系统对组合镀层进行了动电位扫描极化曲线测试.研究了镀层腐蚀后的表面形貌和成分.结果表明,在腐蚀介质中,电镀锌-镍合金层首先发生腐蚀,之后发生化学镀镍层的腐蚀,电镀锌-镍合金层不仅对化学镀镍底层的腐蚀起到机械保护作用,还作为牺牲阳极起到电化学保护作用,因此延缓了腐蚀介质对镁合金基体的腐蚀.
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