GB777371A - Improvements in or relating to processes of chemical nickel plating - Google Patents

Abstract

777,371. Coating with nickel-phosphorus alloy. GENERAL AMERICAN TRANSPORTATION CORPORATION. Nov. 29, 1954 [May 18,1954], No. 34510/54. Classes 82(1) and 82(2) ' A bright smooth nickel plating is deposited upon the surface of a body of catalytic material by providing a hot aqueous chemical nickel plating bath of the nickel cation-hypophosphite anion type, injecting a " light inert gas," i.e. hydrogen, helium, methane, neon or a mixture thereof, from an external source into said bath in order to maintain a dispersion of the gas in the bath, and contacting said body with the bath having the dispersion of gas therein. The process may be carried out in the continuous plating system shown, in which the plating solution is circulated between storage compartments 19 and plating tank 12 and regenerated by suitable additions in regeneration compartment 20. Hydrogen, the preferred gas, is introduced into the bottom of tank 12, in which are suspended the articles 34 to be plated, from bottle 23, either by way of mixing device 24 and thus together with the plating solution, or through the diffusion plate 25, and rises through the tank 12 to sweep the articles 34 and escape from the top of said tank. Plating baths referred to include those containing complexing agents, exalting additives and stabilizing additives, e.g. lactic acid, malic acid, succinic acid, glycine and tellurium. Catalytic materials which may be plated include Fe, Co, Ni. Ru, Rh, Pd, Os, Ir, Pt, Cu, Ag, Au Be, Ge, Al, C, V, Mo, W, Cr, Se, Te and U, and it is stated that the plating deposited is actually a nickel-phosphorus alloy containing 3-11 per cent phosphorus.