超声电沉积铜薄膜的耐腐蚀性能研究

Corrosion Performance of Ultrasonic-electrodeposited Cu Coating

采用超声电沉积法制备了一种铜薄膜,利用浸泡腐蚀实验、电化学测试、金相显微观察和X射线衍射分析等研究了其显微组织和耐腐蚀性.结果表明:与普通电沉积铜薄膜相比,超声电沉积铜薄膜在20%HNO3溶液中开始冒气泡的时间延迟了近2倍,腐蚀速率明显降低;在3.5%NaC l溶液中自腐蚀电位明显高于普通电沉积铜薄膜,自腐蚀电流不及后者的1/2;超声电沉积铜薄膜,晶粒明显小于普通电沉积试样;(200)晶面取向明显增强,(111)衍射峰值也有所增加,(220)取向则显著减弱;从微观上解释了超声电沉积铜薄膜具有较好耐腐蚀性能的原因.

A special Cu coating was coated on a stainless steel substrate by ultrasonic-associated electrodeposition.The corrosion performance and the microstructure of the coating were investigated by weight loss measurement,anodic polarization curves,micrographs and XRD respectively.In comparison with the conventional electrodeposited Cu coating,the ultrasonic-electrodeposited Cu coating shows the following characters：the time to corrosion initiation in 20% HNO3 solution is longer nearly 2 times,the corrosion rate is obviously decreased;the corrosion potential in 3.5% NaCl solution is higher,the corrosion current desity is less than half and the average size of crystallites is obviously smaller.The 200 preferential texture became stronger and the 111 preferential texture also became stronger to some extent too,while the 220 preferential texture became much weaker.These may be the reason for its better corrosion resistance.