Method for activating titanium surfaces for subsequent plating with metallic coatings

US4340620A · kind A · utility

Assignee

• MTU Motoren-und Turbinen-Union · DE

Inventors

• Gotz Mielsch · Munich, DE
• Rolf-Jorg Dunker · Dachau, DE
• Martin Thoma · Munich, DE

Key dates

• Filing date: Feb 26, 1981
• Grant date: Jul 20, 1982
• Expiry date: Feb 26, 2001

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C23G1/106
• WIPO field: Surface technology, coating
• WIPO sector: Chemistry

Abstract

A method for activating titanium surfaces for subsequent plating with metallic coatings comprising: PA0 (a) wet peening the titanium surface to be plated using fine-grain Al.sub.2 O.sub.3, PA0 (b) pickling the peened surface with a fluoridic solution at room temperature for several minutes, and PA0 (c) activating the surface with a solution containing chromium, fluorine, and arsenic or antimony at temperatures of 35.degree. to 100.degree. C. for fifteen to fifty minutes. The molar ratio of fluorine to arsenic or antimony is between six and seven, and the molar ratio of chromium to antimony or arsenic is between three and six.