Crack resistance and crack resistance aluminum alloy member, of the porous type anodic oxide film excellent in corrosion resistance and how to check the corrosion resistance, as well as crack resistance and the conditions for forming the porous type anodic oxide film with excellent corrosion resistance setting method

摘要

PROBLEM TO BE SOLVED: To provide an aluminum alloy member having a porous-type anodic oxide coating superior in cracking resistance and corrosion resistance formed on the surface of a substrate made from an aluminum alloy.;SOLUTION: The aluminum alloy member has the porous-type anodic oxide coating formed on the surface of the aluminum alloy substrate which is composed of, by mass%, 0.4-1.5% Mg, 0.4-1.5% Si, 0.4-1.5% Mn, Fe, Cr and Cu contents respectively controlled to 0.03 mass% or less and the balance Al with unavoidable impurities. The film thickness of the coating film is 30 m or more, and a relationship between a porosity of the coating film and a true density of the coating film satisfies the condition of "porosity of coating film 61-7true density of coating film".;COPYRIGHT: (C)2010,JPO&INPIT