Non-chromium post-treatment for aluminum coated steel
First Claim
1. Process for improving the adhesion bonding and corrosion resistance of aluminum and aluminum alloys coated on steel substrates which comprises treating the coated steel substrates with effective amounts of an acidic aqueous solution having a pH ranging from about 2.5 to 5.5 at solution temperatures ranging from ambient to about 200°
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said acidic aqueous solution comprising, per liter of solution, from about 0.1 to 22 grams of at least one hexafluorozirconate, from about 0.1 gram up to the solubility limit of at least one cationic zinc compound, from 0.0 to 10 grams of at least one water soluble thickener and from 0.0 to 10 grams of at least one water soluble surfactant.
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Abstract
Compositions and process for post-treating aluminum and aluminum alloy coated steel substrates to improve the corrosion resistance and adhesive bonding strength of the aluminum coated substrates. The composition comprises treating the aluminum or aluminum alloy coated steel substrates with an acidic aqueous solution comprising, per liter of solution, from about 0.1 to 22 grams of a hexafluorozirconate, from about 0.1 gram up to the solubility limit of a water soluble cationic zinc compound and, optionally, effective amounts of water soluble thickeners and/or surfactants.
31 Citations
26 Claims
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1. Process for improving the adhesion bonding and corrosion resistance of aluminum and aluminum alloys coated on steel substrates which comprises treating the coated steel substrates with effective amounts of an acidic aqueous solution having a pH ranging from about 2.5 to 5.5 at solution temperatures ranging from ambient to about 200°
- F.;
said acidic aqueous solution comprising, per liter of solution, from about 0.1 to 22 grams of at least one hexafluorozirconate, from about 0.1 gram up to the solubility limit of at least one cationic zinc compound, from 0.0 to 10 grams of at least one water soluble thickener and from 0.0 to 10 grams of at least one water soluble surfactant. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 21)
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10. Process for post-treating aluminum and aluminum alloy coated steel to improve the corrosion resistance and adhesive bonding which comprises treating the aluminum coated steel with an acidic aqueous solution having a pH ranging from about 3.7 to 4.0 at temperatures ranging from room temperature to about 120°
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said acidic aqueous solution comprising, per liter of solution, from about 1.0 to 12 grams of an alkali metal hexafluorozirconate, from about 0.1 to 12 grams of at least one divalent zinc compound, from 0.5 to about 1.5 grams of a water soluble thickener and from 0.5 to about 1.5 grams of a water soluble surfactant. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 22)
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- 23. Composition for improving the adhesion bonding and corrosion resistance of aluminum and aluminum alloy coated steel substrates 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, from about 0.1 gram up to the solubility limit of a cationic zinc compound, from about 0.0 to 10 grams of at least one water soluble thickener and from 0.0 to about 10 grams of at least one water soluble surfactant.
Specification