| abstract |
PROBLEM TO BE SOLVED: To provide a corrosion-resistant composite layer having bare or post-paint corrosion resistance equal to or higher than that of a conventional chromate film without using hexavalent chromium at all, and further exhibiting excellent workability. Provide an aluminum-based metal plate. SOLUTION: On an aluminum-based metal plate, an intermediate layer having an inorganic colloid and a group IVA compound as main components and a thickness of 0.5 μm or less, and a rare earth compound, an inorganic colloid and a resin as main components on the intermediate layer. An aluminum-based metal plate having a corrosion-resistant composite layer, comprising a resin-based corrosion-resistant layer having a thickness of 0.2 μm or more. |