Conversion coating solutions for treating metallic surfaces
AssigneeNihon Parkerizing Co., Ltd.
InventorsNobuyuki Oda, Haruyoshi Terada
Life of this patent
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Abstract
A conversion coating solution for treating metallic surfaces has a pH value in the range of 3 to 6 and contains 1 g/l to 50 g/l of an acid alkali phosphate as phosphate ions, 0.2 g/l to 20 g/l of one or more of chlorates and bromates, and 0.01 g/l to 0.5 g/l of tin ions, with a weight ratio of chlorine ions to tin ions being between 0.6 and 6. The solution provides a continuous and uniform conversion coating having high anti-corrosion performance.
Claims9
A conversion coating solution for treating metallic surfaces which has a pH value in the range of 3 to 6 and contains 1 g/l to 50 g/l of an acid alkali phosphate as phosphate ions, 0.2 g/l to 20 g/l of at least one chlorate and bromate, and 0.01 g/l to 0.5 g/l of tin ions, with a weight ratio of chlorine ions to tin ions being between 0.6 and 6.
Dependencies are inferred from the claim text.