METHOD OF CHEMICAL COATING FROM NICKEL-COPPER-PHOSPHORUS ALLOY

摘要

FIELD: technological processes.;SUBSTANCE: invention relates to chemical application of metal coating of nickel-based alloys. Method involves holding articles in an aqueous solution containing components at following ratio, mol/l: nickel salt 0.075-0.125; copper salt - 0.0008-0.008, lead salt (0.6-1.2)·10^-5; sodium hypophosphite 0.28-0.40; glycine 0.10-0.40; orthophosphoric acid 0.10-0.30; sodium tetraborate 0.05-0.10, wherein application of coating is performed at solution temperature 70-93 °C and pH 6.3-8.7. Salt solution used is nickel sulphate, chloride or acetate and lead salt is lead nitrate or acetate. Application of coating can be performed on surface of items made of steel, copper and alloys thereof, aluminium and alloys thereof, plastic or fibre and tissue structures from natural or synthetic materials.;EFFECT: invention ensures production of high-quality nickel-copper-phosphorus coating, containing from 5 to 8 % phosphorus and up to 8 % copper, having high lustre and intended for use as protective-decorative and protective and wear-resistant, especially after additional heat treatment.;3 cl, 1 tbl, 9 ex