1.1 This standard covers the requirements for electroplated coatings of nickel and chromium applied to articles made of aluminium and aluminium alloys with a view to improving the appearance as well as the corrosion resistance of their significant surfaces.
1.2 For both nickel and chromium electrodeposits, the minimum thickness requirements apply only to those portions of the significant surface that can be touched by a ball of 20 mm in diameter.
1.3 This standard does not cover coatings applied for :
a) purposes other than protective and decorative;
b) coatings applied to machine screw threads; and
c) coatings applied to sheet, strip, wire in the unfabricated form, or coil springs.
1.4 This standard does not specify the surface conditions that the basis metal is to have prior to the coating processes.
IS 4942-1983 history
1984IS 4942-1983 Specification for nickel and chromium electroplating coatings on aluminum and aluminum alloys