Patent ID: 8741445

Claim:
An aluminum or aluminum alloy material, comprising: a substrate formed by an aluminum or aluminum alloy; a first protective layer on a surface of the substrate; and a second protective layer on the first protective layer, wherein the first protective layer is a conversion coating film including vanadium and at least one or more types of metals selected from the group consisting of titanium, zirconium, and hafnium, a coating weight of the vanadium is 0.3 to 200 mg/m 2 , and a total coating weight of the at least one or more types of the metals selected from the group consisting of titanium, zirconium, and hafnium is 0.1 to 5 in mole ratio when the coating weight of the vanadium is 1; and the second protective layer is an organic coating film having a composition that includes (1) a chitosan derivative and a solubilizing agent therefore, (2) a modified polyvinyl alcohol formed by graft polymerization of a hydrophilic polymer to a side chain of polyvinyl alcohol, and (3) a water-soluble crosslinking agent, wherein a total of the compounds (1) to (3) is 50% by mass or more of the entire second protective layer in terms of solid content, and wherein solid content mass ratios of the respective compounds (1) to (3) are (1)/{(1)+(2)+(3)}=0.1 to 0.8, (2)/{(1)+(2)+(3)}=0.1 to 0.6, and (3)/{(1)+(2)+(3)}=0.05 to 0.3; and a dry mass of the second protective layer per unit area is 0.05 to 6.0 g/m 2 .