Resin-coated aluminum alloy sheet and formed body using resin-coated aluminum alloy sheet

摘要

A resin-coated aluminum alloy sheet which has a chromium-free surface treatment layer and has a coating film formed by applying an organic resin, and which exhibits excellent adhesiveness and excellent corrosion resistance even after being subject to severe forming such as drawing is provided. A resin-coated aluminum alloy sheet includes: an aluminum substrate having a surface treatment film on at least one surface thereof; and an organic resin film layer formed on the surface of the aluminum substrate. The surface treatment film includes 2 mg/m2 to 100 mg/m2 of zirconium in terms of metal atoms and at least any one of a polyitaconic acid, monosaccharide alcohol and disaccharide alcohol as an aluminum-ion-trapping agent.

主权项

1. A resin coated aluminum alloy sheet comprising
an aluminum substrate having a chromium-free surface treatment film on at least one surface thereof, and an organic resin film layer formed over the surface of the aluminum substrate over the surface treatment film, wherein the surface treatment film has a thickness of 1-100 nm, wherein the surface treatment film includes 0.5-20mg/m2 of polyitaconic acid in terms of organic carbon content, the polyitaconic acid being a homopolymer, the surface treatment film including an aluminum ion trapped by at least a part of the polyitaconic acid, the polyitaconic acid having a molecular weight of 260 to 10000000, wherein the surface treatment film includes 2mg/m2-100mg/m2 zirconium in terms of metal atoms, and wherein the zirconium in the surface treatment film includes zirconium bonded to the polyitaconic acid.