SURFACE-PRETREATMENT OF NON-METALLIC ARTICLES FOR CHEMICAL NICKEL-PLATING

摘要

Pretreatment of surfaces of non-metallic articles for chemical nickel-plating. The surface of the article is treated using a pickling solution of concentrated sulfuric acid containing one or more noble metal salts and the noble metal salt adhered to the surface of the article is subsequently reduced to metal to activate the surface, using an aqueous solution of a reducing agent. The pickling step and the reductive activation of the surface of the article are carried out while using the solutions at a uniform temperature of between about 75 DEG and 90 DEG C., and adding a polyphosphonic acid stabilizer to the aqueous solution of the reducing agent.