沉积电流密度对Ni-Co镀层耐蚀性的影响  

Effect of Current Density on Corrosion Resistance of Ni-Co Coatings Electroplated on Carbon Steel

作　　者：张伟 林志峰[1] 许立坤[1] 陈守刚[2] 刘盈[2] ZHANG Wei;LIN Zhifeng;XU Likun;CHEN Shougang;LIU Ying(State Key Laboratory for Marine Corrosion and Protection,Luoyang Ship Material Research Institute,Qingdao 266237,China;Ocean University of China,College of Materials Science and Engineering,Qingdao 266100,China)

机构地区：[1]海洋腐蚀与防护重点实验室中国船舶重工集团公司第七二五研究所,山东青岛266237 [2]中国海洋大学材料科学与工程学院,山东青岛266100

出　　处：《电镀与精饰》2018年第9期1-5,共5页Plating & Finishing

摘　　要：采用电沉积方法在碳钢表面制备了Ni-Co合金镀层,使用扫描电子显微镜和能谱仪分析了不同沉积电流密度下制备镀层的微观形貌和元素组成,并利用极化曲线研究了Ni-Co镀层在天然海水中的耐蚀性能。结果表明,随着沉积电流密度的增加,Ni-Co合金镀层的平整度先增加后降低,镀层中镍钴比例先升高后下降。沉积电流密度为85 mA/cm^2时,Ni-Co合金镀层具有最大的极化电阻和较宽的钝化区,表现出较好的耐蚀性能。Ni-Co alloy coating was prepared using electro-deposition method on the surface of carbon steel.The microstructure and the compositions of the different coating were analyzed using a scanning electron microscope equipped with energy dispersive spectrometer.The corrosion resistance of the coating was tested in natural seawater using polarization curve.The results showed that with the increase of the current density of electro-deposition,the coating became compact with the surface smoothness increased first and then decreased,and nickel in the coating increased first and then decreased.At the current density of 85 mA/cm2 for the electroplating,The coating had the largest polarized resistance and a wide passivation zone,demonstrating good corrosion resistance.

关 键 词：电沉积 Ni-Co镀层 极化曲线 耐蚀性 

分 类 号：TQ153.3[化学工程—电化学工业]