Cu-Ni合金电镀层的结构和耐蚀性  

Microstructure and Corrosion Resistance of Cu-Ni Alloy Electroplating Coatings

作　　者：贺春林[1] 霍嘉翔 房博文 史金明 苏敏 冯海东[1] 马国峰[1] 王建明[1] HE Chunlin;HUO Jiaxiang;FANG Bowen;SHI Jinming;SU Min;FENG Haidong;MA Guofeng;WANG Jianming(Liaoning Provincial Key Laboratory of Advanced Materials, Shenyang University, Shenyang 110044, China)

机构地区：[1]沈阳大学辽宁省先进材料制备技术重点实验室,辽宁沈阳110044

出　　处：《沈阳大学学报（自然科学版）》2020年第4期269-274,280,共7页Journal of Shenyang University：Natural Science

基　　金：国家自然科学基金资助项目(51171118);辽宁省重点研发计划项目(2020JH2/10100011)。

摘　　要：在不同温度下,利用直流电沉积方法在铝青铜表面制备了2种Cu-Ni质量分数不同的Cu-Ni合金镀层.采用场发射扫描电子显微镜及附带的X射线能谱仪(FESEM/EDS)分析了镀层表面与断面的形貌和成分,用电化学测试系统和循环腐蚀试验评价了镀层的耐蚀性.结果显示,Cu-Ni镀层的形貌和成分与电镀液的温度有关,在较高温度下形成的镀层致密度较高,Ni质量分数较低.铜加速乙酸盐雾试验(CASS试验)结果显示,高致密度的镀层具有更高的耐蚀性.在质量分数为3.5%的NaCl水溶液中的极化曲线和电化学阻抗谱结果也显示,较高温度形成的镀层具有更好的耐蚀性.提高镀液温度可提高Cu-Ni镀层的致密度,有利于改善镀层的耐蚀性.Two Cu-Ni alloy coatings with different composition were prepared on copper-manganese-aluminum alloy by direct current electroplating technology,the microstructure and composition of the coating were investigated by field emission scanning electron microscope and attached X-ray energy spectrometer(FESEM/EDS),and the corrosion resistance was evaluated by copper accelerated acetate salt spray test(CASS test)and electrochemical technology.The FESEM/EDS results show that the surface morphology and composition of the Cu-Ni coating depend on the bath solution temperature,and a denser coating with a lower Ni content could be deposited under a higher bath solution temperature.The CASS test results indicate that the denser coating has higher corrosion resistance.Meantime,the polarization curve and electrochemical impedance spectroscopy experimental results also show that the Cu-Ni coating formed under higher bath temperature exhibits better corrosion resistance in 3.5%NaCl aqueous solution,which is associated with its more compact microstructure.This indicates that the enhancing electrolyte temperature can improve the compactness of Cu-Ni electroplating coating,which is beneficial to the improvement in corrosion resistance.

关 键 词：CU-NI合金 电镀层 微结构 CASS试验 耐蚀性 

分 类 号：TG178[金属学及工艺—金属表面处理]