Coating composition for steel product, a coated steel product, and a steel product coating method
AssigneeBethlehem Steel Corporation
InventorsErin T. McDevitt, Scott A. Kriner
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Abstract
A method of coating of steel products such as plate and sheet using an aluminum-zinc coating alloy includes modifying the coating bath with a particulate compound constituent in effective amounts to decrease the spangle facet size of the coated product, improve tension bend rust stain performance, improve coated surface appearance when brushed, and coated product paintability. Constituents include borides such as titanium boride and aluminum borides, carbides such as titanium carbide, and aluminides such as titanium aluminide. The method produces a coated steel product that does not require temper rolling for painting.
Claims16
A coated steel article comprising a steel substrate having a brushed aluminum-zinc alloy coating thereon, said brushed aluminum-zinc alloy coating comprising:
- an effective amount of one or more of a particulate compound constituent selected from the group consisting of boride compounds having one of titanium and aluminum, aluminide compounds containing titanium and iron, and carbide compounds containing titanium, vanadium, iron, and tungsten so that said brushed aluminum-zinc alloy coating has a uniform appearance.
Dependencies are inferred from the claim text.