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六价铬电镀工艺严重污染环境,有望被三价铬电镀取代.三价铬电镀分为氯化物体系和硫酸盐体系,其中硫酸盐体系因具有阳极无有害气体析出、不腐蚀设备等优点,近年来发展迅速.通过大量试验开发出常温甲酸-草酸体系硫酸盐工艺,并借助小槽挂镀、Tafel曲线、EIS曲线和CASS试验等方法对镀液和镀层性能进行了分析.结果表明,在优化工艺条件下,该工艺镀层沉积速率高达0.18μm/min以上,分散能力93%,覆盖能力96%,耐蚀性好,是一种性能优良、高效的三价铬电镀工艺.

The technology for trivalent chromium electroplating at ambient temperature in a sulfate bath containing formate-oxalate oomplexing agents was established based on a series of screening tests. The properties of the plating bath and Cr coating as well were analyzed by making use of suspended plating in a small cell, measurement of Tafel curve and electrochemical impedance spectra, and corrosion-accelerating salt-spraying (CASS) test. Results indicate that a deposition rate of 0. 18 μm/min, a throw power of 93% and a cover power of 96 % are obtained under optimized plating conditions. And the resulting Cr coating had good corrosion resistance, indicating that the established technology might be used for high efficient electroplating of trivalent Cr.

参考文献

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