| 摘要 |
PURPOSE:To electroplate a Zn-Ni alloy having superior corrosion resistance by adding a specified amount of Na2SO4 to a plating bath contg. Zn<2+> and Ni<2+> acidified with sulfuric acid and by regulating the ratio between Zn<2+> and Ni<2+> to a specified value. CONSTITUTION:Na2SO4 is added to a plating bath contg. Zn<2+> and Ni<2+> acidified with sulfuric acid by 0.6-1.0mol/l, and the ratio between Zn<2+> and Ni<2+> is regulated so as to satisfy Ni<2+>/(Zn<2+>+Ni<2+>)=0.55-0.65. Electroplating is carried out with the resulting plating bath at about 0.6-0.8m/sec flow rate, about 50-70 deg.C bath temp. and 80-200A/dm<2> current density to obtain a Zn-Ni alloy layer having about 10-13wt% Ni content. The Zn-Ni alloy layer has improved corrosion resistance and is hardly microcracked.
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