GB1411971A - Process for the immersion plating of copper on iron or steel - Google Patents

Abstract

1411971 Plating with copper IMPERIAL CHEMICAL INDUSTRIES Ltd 23 March 1973 [7April 1972] 16150/72 Heading C7F Iron or steel is plated with Cu by immersion in an aqueous bath containing a soluble Cu salt, an agent capable of complexing Cu ions, and a conjugated unsaturated nitrile or oxime. The Cu salt may be the sulphate, chloride, acetate, borate, citrate, phosphate or bromide, and 0.01-20 wt per cent may be used; the complexing agent may be 1-30% of an amine such as aniline, ethylene diamine, hexamethylene diamine, hexamethylene imine, cyclohexylamine or hexylamine, and the nitrile or oxime, in amount 0.05-5%, may be benzonitrile, cinnamonitrile, 1-cyano-4-phenylbuta-1, 3-diene, phenylhepta,-2,-4,6-trienonitrile, 2-pentenenitrile, crotononitrile, cinnamaldoxime, benzaldoxime, or benzalacetone oxime. The bath may also contain 0-30% of an acid compatible with the Cu salt, and an organic solvent such as acetone, methanol or ethanol; a substrate cleaned mechanically or in an acid bath containing an inhibitor, e.g. an unsaturated nitrile and/or oxime, is immersed in the solution for a few seconds to 30 minutes at up to 100‹C; coating may take place in two or more stages with intermediate rinsing, and the Cu coat may be treated with an anti-tarnish agent such as benzotriazole or lacquer.