摘要
研究了电解镍阳极和含硫的活性镍阳极在氨基磺酸盐电解液中的阳极行为。阳极极化曲线的测定结果表明，电解镍阳极较之合硫活性镍阳极容易钝化得多，前者的临界钝化电流密度仅为后者临界钝化电流密度的1／40。工艺实验结果证明，含硫活性镍阳极在宽广的电位范围内只进行金属镍的电化学溶解反应；而电解镍阳极在发生镍的阳极溶解反应的同时，还进行着NH2SO3离子的氧化反应。采用电解镍阳极对电解液进行小电流电解10～40Ah／L，所得电沉积钱层的内应力明显降低。根据以上实验结果提出了获得低内应力电沉积钦层的方法。
Anodic behaviour of electrolytic nickel anode and sulfur-containing active nickel anode in sulfamate electrolyte was investigated. Results of anodic polarization curve measurement experimentsshow that electrolytic nickel anode is passivated much easier than sulfur-containing active nickelanode and the critical passivation current density of the former is only about one fortieth of the latter. Technological experimental results prove that on sulfur-containing active nickel anode onlyelectrochemical dissolution reaction of nickel is proceeded in a rather wide potential range, while onelectrolytic nickel anode, reaction of sulfamate ion oxidation can occur simultaneously with nickelanodic dissolution reaction. Electrolysis treatment of the sulfamate electrolyte at lower currentdensity using electrolytic nickel anode for 10-40 Ah/L can decrease significantly the internalstress of the nickel coating electrodeposited. Based on the above experiemental results, methodsfor obtaining low internal stress nickel coating electrodeposited from sulfamate bath were proposed.
出处
《电镀与精饰》
CAS
1997年第5期1-7,共7页
Plating & Finishing
关键词
镍
阳极
钝化
氨基磺酸盐
电解液
电极
nickel, anodic behaviour, passivation, sulfamate, internal stress
