采用中性盐雾试验和电化学阻抗谱,研究了酸性氯化钾镀锌、碱性无氰镀锌和碱性氰化物镀锌3种工艺所得镀锌层经三价铬彩色钝化后钝化膜的耐蚀性.结果表明:钝化后,酸性氯化钾镀锌层的耐蚀性最好,碱性无氰镀锌层次之,碱性氰化物镀锌层最差.在质量分数为1%的氯化钠溶液中,镀锌层钝化膜电阻的大小顺序为:酸性氯化钾镀锌>碱性无氰镀锌>碱性氰化物镀锌.酸性氯化钾镀锌钝化膜的耐蚀性较好可以与所得镀层中有机杂质夹杂较少有关.
The Zn coatings electroplated respectively from acid potassium chloride, alkaline non-cyanide and alkaline cyanide electrolytes were passivated with a trivalent chromium iridescent passivating agent. The corrosion resistance of the passivation films was studied by neutral salt spray (NSS) test and electrochemical impedance spectroscopy (EIS). The results showed that the corrosion resistance of the passivation films and their electrical resistance in a 1% (mass fraction) NaCI solution for different Zn electroplating processes are in the following descending order: acid potassium chloride > alkaline non-cyanide > alkaline cyanide. The better corrosion resistance of the acid potassium chloride Zn plating coating may be attributed to the less incorporation of organic impurities.
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