Patent ID: 7005194

Claim:
An aluminum or aluminum alloy member having an anodized film formed thereon, wherein the anodized film comprises a porous layer and a non-porous barrier layer between the porous layer and the member; the non-porous barrier layer has a structure that is at least partly boehmite or pseudo-boehmite; and the anodized film is characterized by that the film dissolving rate measured by the test for immersion in a mixture of phosphoric acid and chromic acid (conforming to JIS H8683-2) is less than 120 mg/dm 2 /15 min, the ratio of area in which corrosion occurs after standing for 2 hours in an atmosphere of argon containing 5% chlorine (at 300° C.) is less than 15%, and the film hardness (Hv) is no lower than 420.