Patent ID: 6686053
Filing Date: 2004-02-03
Classification: C22C,C25D,Y10T

Abstract:
An Al alloy member having excellent corrosion resistance, which comprises an Al or Al alloy substrate having an anodic oxide film including a porous layer and a pore-free barrier layer, wherein at least a part of a structure of said barrier layer is altered into boehmite and/or pseudo-boehmite, a dissolution rate of said film is at 100 mg/dm2/15 minutes or below when determined by an immersion test in phosphoric acid/chromic acid defined in JIS H 8683-2, and a corroded area percent is at 10% or below after allowing said film to stand in an atmosphere of 5% Cl2â€”Ar gas at 400Â° C. for 4 hours.