Global Patent Index - EP 0064295 B1

EP 0064295 B1 19851121 - METHOD OF IMPROVING THE CORROSION RESISTANCE OF CHEMICAL CONVERSION COATED ALUMINUM

Title (en)

METHOD OF IMPROVING THE CORROSION RESISTANCE OF CHEMICAL CONVERSION COATED ALUMINUM

Publication

EP 0064295 B1 19851121 (EN)

Application

EP 82103813 A 19820504

Priority

US 26037081 A 19810504

Abstract (en)

[origin: EP0064295A1] A method for treating aluminum prior to applying a chemical conversion coating for improving its corrosion resistance especially when rigid requirements need to be met. The aluminum is alkaline cleaned and deoxidized, preferably with a non-chromated deoxidizer. A supplementary treatment consists of immersing the deoxidized aluminum in a potassium or sodium nitrite solution. The aluminum is then coated with a standard chemical conversion coating, and dried at a temperature between 110 DEG F and 130 DEG F. The resulting product is able to pass salt spray test requirements as outlined in the military specification.

IPC 1-7

C23F 11/00; C23F 17/00; C23F 1/00; C23F 1/20; C23G 1/12

IPC 8 full level

C23C 22/78 (2006.01)

CPC (source: EP)

C23C 22/78 (2013.01)

Designated contracting state (EPC)

DE FR GB IT NL SE

DOCDB simple family (publication)

EP 0064295 A1 19821110; EP 0064295 B1 19851121; DE 3267535 D1 19860102

DOCDB simple family (application)

EP 82103813 A 19820504; DE 3267535 T 19820504