镍电极上硫酸盐溶液体系三价铬电沉积动力学初探  

Study on kinetics of trivalent chromium electrodeposition on nickel electrode from sulfate solution

作　　者：谢晔[1] 曾振欧[1] 王伟[1] 邓远富[1] 

机构地区：[1]华南理工大学化学与化工学院,广东广州510640

出　　处：《电镀与涂饰》2015年第13期709-713,共5页Electroplating & Finishing

摘　　要：采用阴极极化曲线法、循环伏安曲线法和恒电位电解试验探讨了硫酸盐溶液体系三价铬在镍电极上电沉积的电化学行为和动力学规律。以二水甲酸钠为主配位剂、甘氨酸为辅助配位剂时,首先在镍电极上进行析氢反应,当阴极电位负于-1.35 V时才会有明显的三价铬电沉积现象。镍电极表面的析氢反应过程和三价铬电沉积过程均为不可逆电极过程。镀液Cr(III)含量和p H的增大具有增强阴极极化的作用;温度以及二水甲酸钠、甘氨酸和硫酸铵含量的增大则具有降低阴极极化、提高阴极反应速率的作用。The electrochemical behavior and kinetic law of trivalent chromium electrodeposition on nickel electrode from a sulfate solution were studied by measuring cyclic voltammograms and cathodic polarization curves and conducting potentiostatic electrolysis test. Hydrogen evolution reaction occurs first on nickel electrode in the solution using sodium formate dihydrate as main complexant and glycine as auxiliary complexant, and obvious trivalent chromium electrodeposition takes place only when cathodic voltage is more negative than -1.35 V. Both hydrogen evolution and trivalent chromium electrodeposition are irreversible electrode processes. The increase of Cr（HI） content and pH has an effect of enhancing cathodic polarization while the increase of temperature and contents of sodium formate dihydrate, glycine, and ammonium sulfate weakens cathodic polarization and accelerates cathodic reaction.

关 键 词：三价铬 硫酸盐 电沉积 镍电极 动力学 

分 类 号：TQ153.11[化学工程—电化学工业]