SiO_(2)粒径对Ni-Co-SiO_(2)复合镀层性能的影响  

Effect of SiO_(2) Particle Size on Properties of Ni-Co-SiO_(2) Electrodeposited Composite Coatings

作　　者：白双锋 刘雪辉 许立坤[1] 玄俊极 邵阳 辛永磊[1] 李相波[1] 范林[1] BAI Shuangfeng;LIU Xuehui;XU Likun;XUAN Junji;SHAO Yang;XIN Yonglei;LI Xiangbo;FAN Lin(Science and Technology on Marine Conosion and Protection Lahniatory,Luoyang Ship Material Research Institute,Qingdao 266237,China)

机构地区：[1]中国船舶重工集团公司第七二五研究所海洋腐蚀与防护重点实验室,山东青岛266237

出　　处：《材料开发与应用》2021年第6期12-20,共9页Development and Application of Materials

摘　　要：长期暴露在海洋环境中的钢质紧固件的腐蚀问题严重影响了海洋工程装备和设施的服役安全性.电镀合金镀层是紧固件常用的防护方法,其中,镍钴合金镀层具有较好的耐蚀性.通过向Ni-Co镀液中添加不同粒径的SiO_(2)颗粒,利用电沉积技术在45钢基体上制备Ni-Co-SiO_(2)复合镀层.之后,分析了SiO_(2)粒径对复合镀层表面形貌和显微结构的影响,评价了复合镀层在3.5%(w)的NaCl溶液中的耐蚀性能,并对复合镀层的显微硬度和摩擦系数进行了测试.结果表明,随着镀液中SiO_(2)粒径的增大,复合镀层表面的SiO_(2)分布均匀性先增大后减小,当SiO_(2)粒径为70 nm时,镀层表面形成较完整的SiO_(2)膜层.动电位极化和电化学阻抗谱测试表明,掺杂70 nm的SiO_(2)的复合镀层具有最好的耐蚀性.随着镀液中SiO_(2)粒径增大,复合镀层的硬度逐渐降低,但其对摩擦系数的影响较小.The corrosion of steel fasteners exposed to marine environment for a long time seriously affects the service safety of marine engineering equipment and facilities.Electroplated alloy coating is a common protection method for fasteners,among which nickel-cobalt alloy coating has better corrosion resistance.In the study,Si0_(2) particles with different particle sizes are added into Ni-Co plating solution,and by the method of electrodeposition,Ni-Co-Si0_(2) composite is coated on 45 steel.Influences of Si0_(2) particle size on surface morphology and microstructure of the composite coating are analyzed,and corrosion resistance of the composite coating in NaCl solution with mass fraction of 3.5%evaluated.Microhardness and friction coefficient of the composite coating are tested.The results show that with the increase of Si0_(2) particle size in the bath,the distribution uniformity of Si0_(2) on the surface of the composite coating increases first and then decreases.When the Si0_(2) particle size is 70 nm,a more complete Si0_(2) film is formed on the surface of the coating.Potentiodynamic polarization and electrochemical impedance spectroscopy tests show that the composite coating doped with 70 nm Si0_(2) has the best corrosion resistance.With the increase of Si0_(2) particle size in the bath,the hardness of composite coating decreases gradually,but its effect on friction coefficient is slight.

关 键 词：镍钴镀层 纳米二氧化硅 电沉积 腐蚀防护 

分 类 号：TG178[金属学及工艺—金属表面处理]