柠檬酸-酒石酸盐无氰镀铜工艺研究

Study of citric acid-tartrate non-cyanide copper plating process

研究了一种柠檬酸-酒石酸盐无氰镀铜工艺,通过正交试验确定的最佳工艺条件为:碱式碳酸铜55g/L,柠檬酸260g/L,酒石酸钾钠32g/L,碳酸氢钠1.5g/L,光亮剂(二氧化硒和三乙醇胺)0.02g/L,pH为9.0,温度35°C,电流密度为1.5A/dm2,阴、阳极面积比为1:2,时间8min。镀液和镀层的性能测试结果表明:镀液稳定,镀液分散能力为84.52%,镀液覆盖能力为4.5,工艺得到的镀层达到二级光亮以上,镀层结晶细致、均匀,镀层结合力良好、孔隙率低,可作为碳钢制品的装饰性镀层和续镀其他金属或合金的底层或中间镀层。

A kind of citric acid-tartrate non-cyanide copper plating process was studied. The optimal process conditions determined by orthogonal test are as follows： basic copper carbonate 55 g/L, citric acid 260 g/L, potassium sodium tartrate 32 g/L, sodium hydrogen carbonate 1.5 g/L, brightener （comprising SeO2 and triethanolamine） 0.02 g/L, pH 9.0, temperature 35 ℃, current density 1.5 A/dm^2, cathode-toanode area ratio 1：2 and time 8 minutes. The performance test results of the coating and solution showed that the solution is stable with throwing power 84.52% and covering power 4.5. The brightness of the coating reaches the level of grade two and the coating has the features of fine and even grain, good adhesion and low porosity. The coating can be used as a decorative coating on carbon steel and continuous coating on metal or alloys as a primer or mediate coating.