钢铁件直接浸镀Cu-Sn合金

Direct Immersion Plating Process of Golden Cu-Sn Alloy on Iron and Steel

钢铁件直接浸入含CuSO_4、SnSO_4、H_2SO_4、稳定剂FS-l和络合剂的溶液中5～10 min,可以获得具有装饰性金黄色的Cu-Sn合金层。研究了浸镀液中CuSO_4SnSO_4浓度对浸镀层中Cu含量和颜色的影响,同时还比较了稳定剂FS-l和NaF的效果,发现FS-l比NaF具有更好的效果。用盐水浸泡和H_2S加速腐蚀试验测定了浸铜层、浸Cu-Sn层的耐蚀与防变色性能,结果表明浸Cu-Sn层的耐蚀性比浸Cu层更好。从俄歇电子能谱的深度剥蚀曲线的组成恒定区求得镀层的组成元素的相对原子百分浓度分别为68％Cu、13％O、8％Sn、6％Fe。文中还讨论了Cu^(2+)、Sn(2+)离子同时在铁上置换反应的原理及浸镀液中Cu(2+)、Sn(2+)的分析方法。

A decorative golden Cu-Sn alloy deposit was formed by immersing steel or iron for 5～10 min in the solution containing CuSO_4, SnSO_4, H_2SO_4, stabilizer FS-1 and complexing agent. The effects of CuSO_4, SnSO_4 concentrations in the solution on copper content percentage and colour of the deposit were studied. The stabilizing effect of stabilizer FS-1 and NaF were compared. The anticorrosive and antitarnishing abilities for salt water and H_2S gas were determined by salt water immersion and H_2S accelerating test. The principle of substitution reaction of Cu^(2+), Sn^(2+) ions on iron and analysis of Cu^(2+) , Sn^(2+) in immersion solution were discussed.