ZHL-02置换镀和电镀银层的耐蚀性能研究  

Study on the Corrosion Resistance of Silver Coatings Prepared by ZHL-02 Replacement Plating and Electroplating

作　　者：郑乐怡 王荣 姚佳雯 卢玄冰 俞巧珍[1] 于晓辉 张楠 史天静 赵健伟[1] ZHENG Leyi;WANG Rong;YAO Jiawen;LU Xuanbing;YU Qiaozhen;YU Xiaohui;ZHANG Nan;SHI Tianjing;ZHAO Jianwei(College of Materials and Textile Engineering,Jiaxing University,Jiaxing 314001,China;College of Design,Jiaxing University,Jiaxing 314001,China;Jiangsu Donghua Analytical Instrument Co.,Ltd.,Jingjiang 214500,China)

机构地区：[1]嘉兴学院材料与纺织工程学院,浙江嘉兴314001 [2]嘉兴学院设计学院,浙江嘉兴314001 [3]江苏东华分析仪器有限公司,江苏靖江214500

出　　处：《材料保护》2024年第1期58-64,共7页Materials Protection

基　　金：嘉兴学院大学生SRT创新项目(8517221248)资助。

摘　　要：镀银方法可分为置换镀和电镀,为了比较这2种方法制得的镀层的耐蚀性能和电偶腐蚀行为,利用扫描电子显微镜、XRD、电化学工作站、Tafel曲线和电偶腐蚀方法研究了以5, 5-二甲基酰胺为主配位剂的无氰镀银工艺中ZHL-02置换镀和ZHL-02电镀镀层的耐蚀性能和电偶腐蚀行为。结果表明:置换镀层结晶好,覆盖更完整,在同等厚度条件下,抗电偶腐蚀性能略优于电镀层。随着置换镀银时间的延长,镀层的自腐蚀速率逐渐下降。但其耗时长,且难以获得1μm以上的厚度,一定程度上限制了其应用。相较于置换镀,电镀的速率快得多,电镀5 min就可获得> 2.4μm的银镀层。随着电镀时间的延长,银层中会出现较大的颗粒,形成细小气孔等缺陷结构,电镀银时间为1、2、5 min时,对应的自腐蚀速率分别为7.15×10^(-3)、5.30×10^(-3)、4.27×10^(-3) mm/a。电镀时间从1 min延长到2 min,再延长到5 min时,镀层的平均电偶腐蚀速率出现了先下降后增大的现象。Silver plating can be divided into replacement plating and electroplating. In order to compare the corrosion resistance and galvanic corrosion behavior of coatings prepared by these two methods, the corrosion resistance and galvanic corrosion behaviors of the ZHL-02 replacement plating and ZHL-02 electroplating coatings in cyanide-free silver plating process using 5, 5-dimethylamide as the main complexing agent were analyzed by scanning electron microscopy, XRD, electrochemical workstation, Tafel curve and galvanic corrosion methods. Results showed that the replacement coating had better crystallization and more complete coverage, and its resistance to galvanic corrosion was slightly better than that of the electroplating coating under the same thickness. With the prolongation of replacement silver plating time, the self-corrosion rate of the coating gradually decreased. However, the replacement plating took a long time, and it was difficult to obtain a thickness of more than 1 μm, which limited its application to a certain extent. Compared with replacement plating, the plating speed of electroplating was much faster, the silver coating >2.4 μm could be obtained for 5 min. As the extension of electroplating time, larger particles would appear in the silver coating, forming defective structures such as tiny pores. When the electroplating silver times were 1, 2, and 5 min, the corresponding self-corrosion rates were 7.15×10^(-3), 5.30×10^(-3) and 4.27×10^(-3) mm/a respectively. Besides, when the electroplating time was extended from 1 min to 2 min and then to 5 min, the average galvanic corrosion rate of the coating decreased first and then increased.

关 键 词：无氰镀银 置换镀 电镀 耐蚀行为 

分 类 号：TQ153.1[化学工程—电化学工业]