介绍了一种电镀光亮Zn-Ni合金的新工艺.应用赫尔槽试验、小槽电镀、扫描电子显微镜等方法,研究了溶液中ρ(Ni2+)/ρ(Zn2+)、温度、pH、阴极电流密度等对合金镀层中含Ni量的影响.其溶液组成是:100～120g/L焦磷酸钾,45～55g/l柠檬酸钠,25～35g/L ZnSO4.7H2O,35～45g/L NiSO4.6H2O, 0.2～0.4g/L 添加剂 A, 0.1～0.2g/L添加剂 B.实验结果表明, 在θ=10～35℃, pH=8～10,Jκ=0.5～5A/dm2 条件下,可得到w(Ni)为12%～18%的光亮的、耐蚀性能好的Zn-Ni合金镀层.%A new technology of bright Zn - Ni alloy electroplating was proposed in this paper. The effects of ρ( Ni2+ )/ρ(Zn2+ ), temperature, pH value, cathodic current density on the content of Ni in Zn -Ni alloy coating were investigated by Hull cell tests, small bath electroplating and scanning electronic microscopy. The optimum composition of plating electrolyte was 100 ~ 120g/L potassium pyrophosphate,45 ～ 55g/L sodium citrate, 25 ～ 35g/L ZnSO4 · 7H2 O, 35 ～ 45g/L NiSO4 · 6 H2 O, 0.2 ～ 0.4g/L additive A and 0.1 ～0.2g/L additive B. Under the conditions of 10 ～35℃ temperature, pH value of 8 ～ 10,cathodic current density of 0.5 ～ 5.0A/dm2, a bright Zn - Ni alloy coating with Ni content of 12％ ～18％ and higher corrosion resistance was obtained.
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