镀锌层无铬钝化工艺的研究

研究了用于锌镀层彩色钝化的无铬钝化液最佳配方及工艺.以钼酸盐为主要原料,通过加入协同缓蚀剂,控制工艺条件可得到呈亮丽彩虹色的钝化膜,并开发了一种封闭处理工艺以提高膜层的耐蚀性.通过电化学测试手段比较了铬酸盐钝化膜、钼酸盐钝化膜及镀锌层的耐蚀性能.

Chromium-Free Passivation Process for Zinc Coating

A chromium-free colorful passivation technology for zinc coating was developed. Thus the beautiful rainbow-color-like passivation film was obtained on the zinc coating by properly controlling the passivation condition in the presence of major raw material molybdate and a synergistic inhibitor. The optimized passivation process was established, and the corrosion resistance of the molybdate conversion coating was investigated by means of electrochemical techniques using chromate conversion coating and zinc coating as the comparisons. It was found that the chromium-free passivation process based on the molybdate could be used to effectively increase the corrosion resistance of the zinc coating.