Non-chromium conversion coatings for ferrous alloys
First Claim
1. Composition for preparing conversion coatings for ferrous alloys to improve the corrosion resistance and adhesive bonding strength of the alloys which comprises an acidic aqueous solution having a pH ranging from about 2.5 to 5.5 and per liter of solution, from about 0.1 to 22 grams of hexafluorozirconates, and from about 0.1 gram up to the solubility limit of a divalent zinc compound, from 0.0 to about 10 grams of at least one water soluble thickener and from 0.0 to about 10 grams of at least one water soluble surfactant.
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Abstract
Composition and process for coating ferrous alloys to improve the corrosion resistance and adhesive bonding strength of the alloys. The process comprises using the composition for treating the ferrous alloys such as steel with an acidic aqueous solution comprising, per liter of solution, from about 0.1 to 22 grams of hexafluorozirconates, effective amounts of at least one water soluble divalent zinc compound, and 0.0 to 10 grams of water soluble thickeners and/or water soluble surfactants.
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Citations
20 Claims
- 1. Composition for preparing conversion coatings for ferrous alloys to improve the corrosion resistance and adhesive bonding strength of the alloys which comprises an acidic aqueous solution having a pH ranging from about 2.5 to 5.5 and per liter of solution, from about 0.1 to 22 grams of hexafluorozirconates, and from about 0.1 gram up to the solubility limit of a divalent zinc compound, from 0.0 to about 10 grams of at least one water soluble thickener and from 0.0 to about 10 grams of at least one water soluble surfactant.
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5. Process for preparing conversion coatings on ferrous alloys to improve the corrosion resistance and adhesive bonding of the alloys which comprises treating said alloys with an acidic aqueous solution having a pH ranging from about 3.7 to 4.0 at temperatures ranging from about ambient to 200°
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said acidic aqueous solution comprising, per liter of solution, from about 0.1 to 22 grams of a hexafluorozirconate, and from about 0.1 gram up to the solubility limits of a divalent zinc compound, from 0.0 to about 10 grams of at least one water soluble thickener and from 0.0 to about 10 grams of at least one water soluble surfactant. - View Dependent Claims (6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20)
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Specification