镀镍溶液中甘氨酸对Ni^(2+)、Zn^(2+)电化学行为的影响

The Effect of Glycine on the Electrochemical Behavior of Ni^(2+) and Zn^(2+) in the Baths for Nickel Plating

运用阴极极化法和循环伏安法研究了镀镍溶液中甘氨酸对Ni2＋、Zn2＋以及Ni2＋＋Zn2＋电化学行为的影响。结果表明，电沉积Ni、Ni－Zn合金过程中，甘氨酸能抑制H＋的放电；在低电流区，甘氨酸有去极化作用，在高电流区有增大极化作用。在被Zn2＋污染了的镀镍溶液中加入甘氨酸．可获得含有少量Zn的Ni－Zn合金电沉积层，其沉积层的耐蚀性比纯Ni沉积层更好。

The effect of glycine on the electrochemical behavior of Ni2+, Zn2+, Ni2+ +Zn2+ in the baths for nickel-plating were studied by means of cathodic polarization and cyclic voltammetry. The test results showed that, during Ni and Ni-Zn alloys electrodepositing, glycine inhibited the discharge of H+, decreased the cathodic polarization at low current zone and increased the cathodic polarization at high current zone. When glycine was added to the nickel plating solution polluted by Ni2+,Ni-Zn alloy deposit was obtained, it contained a little zinc and its properties of anticorrosion was better than pure nickel deposit.