Method for preventing filiform corrosion of aluminum wheels by powder coating with a thermosetting resin
AssigneeMorton International, Inc.
InventorsR. K. Sammel, Paul H. Radcliffe
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Abstract
Filiform corrosion of aluminum and of chrome-plated steel is prevented by covering the surface of the bare metal with a powder coating containing a major amount of a thermosetting resin selected from the group consisting of polyurethanes, polyesters, and acrylics; a minor, adhesion promoting amount of an epoxy resin; and either an ultra-violet light absorber or a hindered amine light stabilizer or a mixture of both, and baking the coated article to give a clear coating on the metal.
Claims9
A method for preventing filiform corrosion on a metal article comprising covering the surface of the metal with a powder coating consisting essentially of a major amount of a thermosetting resin selected from the group consisting of polyurethanes, hydroxy functional polyesters, and glycidyl functional acrylic resins, a curing agent, from about 1% to about 5%, by weight of the coating powder, of an epoxy resin as an adhesion promoting additive, and either an ultra-violet light absorber or a hindered amine light stabilizer or a mixture of both;
- and curing the coated article to give a clear coating on the metal;
- with the proviso that when the powder contains acrylic resin, the curing agent consists of a solid dicarboxylic acid, and when the powder contains a hydroxy functional polyester, the curing agent consists of a blocked isocyanate.
Dependencies are inferred from the claim text.