Title: Passivation of copper and copper-alloy surfaces
Application Number: 86104659 Application Date: 1986.07.09
Publication Number: 1016047 Publication Date: 1988.01.27
Approval Pub. Date: Granted Pub. Date: 1991.06.26
International Classifi-cation: C25D11/38,C25D15/02
Applicant(s) Name: Tianjin Univ. Address:
Inventor(s) Name:
Attorney & Agent: WANG GUOXIN
Abstract:
     It uses a solution containing K2Cr2O7, Al(OH)3, polyolefinic alcohol and distilled water by using an electrolytic electrophoresis method. The specifications of the process used are: cathode current dencity 0.05~0.5 A/dm2, PH value of the solution 6.0-7.5, electrolytic temp. 12-35 deg.C, anodes being made of stainless steel sheets and duration of cathode electrolysis 5-20 mins.
Time: 8