摘要
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 chro-mium electroplating at ambient temperature in a sulfate bath con-taining formate-oxalate complexing 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 electro-chemical 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 electro-plating of trivalent Cr.
出处
《材料保护》
CAS
CSCD
北大核心
2010年第1期25-27,56,共4页
Materials Protection
关键词
三价铬电镀
硫酸盐体系
常温
沉积速率
分散能力
覆盖能力
耐蚀性
trivalent chromium electroplating
sulfate system
ambient temperature
deposition rate
throw power
cover power
corrosion resistance
