Coating preparation for pretreating metal surfaces, and method employing said preparation
AssigneeADW Chemical Products B.V.
InventorJohannes J. H. Verberg
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Abstract
A coating preparation for pretreating metals comprises an acrylic acid or a derivative thereof and barium hydroxide in a proportion by weight of 1:0.08-0.30, as well as chromium compounds, the remainder being conventional additives and water. The amount of acrylic acid or derivative thereof is preferably 2-6% by weight. The amount of chromic acid in the chromium compounds in the coating preparation depends on the type of the metal substrate to be treated. Such a preparation combines, in a single preparation, the desired properties for conversion of the metal and adhesion, which means that instead of 2 separate layers, 1 layer is sufficient.
Claims6
Coating preparation for pretreating metal surfaces comprising an acrylic acid polymer or a polymer based on acrylic acid at 2-6% by weight, a hydroxide of a bivalent metal and hexavalent and trivalent chromium ions, and water wherein the bivalent metal is barium and the proportion by weight of the acrylic acid polymer or a polymer based on acrylic acid and barium hydroxide is 1:0.08-0.30.
Dependencies are inferred from the claim text.