METHOD FOR ELECTROCHEMICAL COATING OF NON-CORROSIVE STEEL WITH NI-CU ALLOYS

摘要

the invention relates to a coating process with alloy electrochemical ni with (30 75% copper in cover) of stainless steel.the coating layer has the role to eliminate the phenomena of thread locking in a corrosive environment. the support cover is applied feritic steel stainless steel or ordinary.the percentage of copper in the alloy, can vary depending on the area of use of the. for a good grip on the support layer, a nickel coating is practice first mata.the process consists in that the material is first washed with warm water skimmed alkalis, acids, descale in mixture, washed with hot water,covered with a layer of nickel matte with thickness of 7 m using a common electrolyte 3, washed with hot water after which is subjected in a bath of electrochemical deposition which contains 50...100 g / l nicl index 2.6h index 2, 10, 15 g / l cucl index 2. 2h index 2, 80, 100 g / l sodium citrate, 3, 8 g / l potassium chloride, 0.01 1 g / l saccharin sodica, having a ph = 0.5...4 at the temperature of 40 60 degree c and the density of current of 1 3 a / dm exponent 3, after which a wash with hot water, washing and drying, pasivizare, obtinu00eendu is a layer with thickness of 10.i..20 alloy with ni by 75%.