Patent
Method for plating gray sn-ni alloy
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TLDR
In this article, a gray plated film having superior corrosion and wear resistances was obtained by adding a specified amount of one or more kinds of amines to an Sn-Ni alloy plating bath having a specified composition.Abstract:
PURPOSE:To obtain a gray plated film having superior corrosion and wear resistances by adding a specified amount of one or more kinds of org. amines to an Sn-Ni alloy plating bath having a specified composition and by carrying out plating with the resulting plating bath. CONSTITUTION:A basic plating soln. contg. 100-500g/l (expressed in terms of metal Ni) nickel chloride, 5-120g/l (expressed in terms of metal Sn) tin chloride, 20-120g/l acidic ammonium fluoride, 2-50g/l sodium phosphite or sodium hypophosphite and 9-75g/l sulfuric acid is prepd. and 10-120ml/l or 2-30g/l one or more kinds of org. amines such as ethylenediamine are added to the plating soln. Plating is carried out with the resulting plating soln. of 3.0-6.5 pH at 30-80 deg.C and 0.04-2.0A/dm current density. A plated Sn-Ni alloy film having a noble gray color, superior corrosion and wear resistances can be formed.read more
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