Ni-P / Ni-W-P双层镀层宏观和微观耐蚀性研究
Research on Macro/micro Corrosion Resistance of Ni-P / Ni-W-P Coatings
吴 华, 李 强, 殷荣幸
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作者单位：常州机电职业技术学院 模具技术系, 江苏 常州 213164
中文关键字：单层镀层； 双层镀层； 阳极极化曲线； 宏观耐蚀性； 微观耐蚀性
英文关键字：Ni-W-P coatings; Ni-P/Ni-W-P double coatings; anode polarizing curves; macro-corrosion resistance; micro-corrosion resistance
中文摘要：采用恒电位极化法结合特殊点微观扫描的方法研究了Ni-P/Ni-W-P双层化学镀层的宏观与微观耐蚀性能。研究表明，Ni-P/Ni-W-P双层镀层的阳极极化曲线具有相当稳定的钝化区，较之相同配方的Ni-W-P单层镀层具有更小的维钝电流密度。两种镀层的腐蚀都是由胞状物开始，并逐渐向边界扩展。
英文摘要：By combining anode polarizing curves and corrosion shape under corresponding electric potential, the corrosion properties of Ni-P/Ni-W-P coatings were studied. The results show that the polarizing curves of Ni-P/Ni-W-P double coatings possess stable passivation area. The double coatings take on less density of maintaining passivity current compared with the same composition of Ni-W-P single coating. The corrosion of both double and single coating spreads from cell like to boundary.