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US 2024/0360563 A1Published application
Hexavalent chromium-free water-based surface treatment solution, surface-treated metal, and surface treatment method
AssigneeNippon Paint Surf Chemicals Co., Ltd.
InventorsToshiaki SHIMAKURA, Motohiro SASAKI
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Abstract
Provided is a hexavalent chromium-free water-based surface treatment solution used for treating metal surfaces. The hexavalent chromium-free water-based surface treatment solution comprises trivalent chromium ion, phosphate ion, sulfate ion, and colloidal silica, wherein the molar ratio of the phosphate ion to the trivalent chromium ion is 1.9-3.2 and the molar ratio of the sulfate ion to the trivalent chromium ion is 0.10-0.30.
Claims10
A hexavalent chromium-free water-based surface treatment solution for use in surface treatment of a metal,
- the hexavalent chromium-free water-based surface treatment solution comprising:
- trivalent chromium ions;
- phosphate ions;
- sulfate ions;
- and colloidal silica,
- the hexavalent chromium-free water-based surface treatment solution having:
- a molar ratio of the phosphate ions to the trivalent chromium ions of 1.9 or more and 3.2 or less;
- and
- a molar ratio of the sulfate ions to the trivalent chromium ions of 0.10 or more and 0.30 or less.
6 more elements
Dependencies are inferred from the claim text.