| 摘要 |
PURPOSE:To simply and easily form nickel layers of a uniform thickness by electroless plating on the stainless steel parts of the structural members of an electrolytic cell even when the shapes of the parts are complex, by treating the parts with an acid to activate the surfaces and by carrying out direct electroless nickel plating. CONSTITUTION:The stainless steel parts of the structural members of an electrolytic cell such as the cathode chamber and the base material of the cathode are pretreated by degreasing and blasting. The pretreated parts are treated with an acid such as hydrochloric acid or oxalic acid at about 30-90 deg.C for about 10min-3hr to activate the surfaces. The activated surfaces are directly subjected to electroless nickel plating without carrying out striking or washing. The nickel plating is carried out at about 80-100 deg.C with a plating bath contg. a nickel salt such as nickel chloride, a reducing agent such as sodium hypophosphite, a complexing agent and a pH buffer or further contg. a dispersant such as TiO2. Nickel layers of about 5-200mum thickness are preferably formed by the nickel plating. |
