The electrodeposition of nickel on copper substrate was carried out in a neutral electrolyte with glycine as complexing agent. The effects of glycine mass concentration, cathodic current density, and electrolyte temperature on the electrodeposition process and properties of nickel coating were studied. The composition of electrolyte and process parameters are as follows: H2NCH2COOH 160 g/L, NiSO4·6H2O 120 g/L, NiCl2·6H2O 12 g/L, H3BO3 35 g/L, temperature 50 ℃, pH 7.0, and current density 0.4 A/dm2. The results showed that the increase of glycine mass concentration enhances the cathodic polarization, reduces the cathodic current efficiency, and produces the nickel coatings with less nodules on their surfaces. The increasing of cathodic current density increases the size of cracks and the number of nodules, while decreases the hardness of nickel coating and the cathodic current efficiency. The increase of electrolyte temperature is beneficial to reduce the cracks and nodules of nickel coating, remarkably improve the microhardness of nickel coating, and enhance the cathodic current efficiency of electrolyte.%采用氨基乙酸作配位剂,在中性电解液中以铜为基材电沉积镍,研究了氨基乙酸质量浓度、阴极电流密度及镀液温度对镍电沉积过程及镀层性能的影响.电解液组成与工艺条件为:H2NCH2COOH 160 g/L,NiSO4·6H2O 120 g/L,NiCl2·6H2O 12 g/L,H3BO3 35 g/L,pH 7.0,温度50℃,电流密度0.4 A/dm2.结果表明,随氨基乙酸质量浓度的增大,电镀镍阴极极化增强,电流效率降低,镍镀层表面结瘤减少;随阴极电流密度的增大,镍镀层表面的裂纹变宽且结瘤增加,硬度和阴极电流效率下降；提高电解液温度有利于减少镍镀层表面的裂纹和结瘤,还能显著提高镍镀层显微硬度和电解液的阴极电流效率.
展开▼
