Metal pretreated with an aqueous solution containing a dissolved inorganic silicate or aluminate, an organofuctional silane and a non-functional silane for enhanced corrosion resistance
First Claim
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1. A method of pretreating metal to improve corrosion resistance, comprising the steps of:
- providing an alkaline solution containing at least one of a dissolved inorganic silicate and a dissolved inorganic aluminate, an organofunctional silane and a crosslinking agent including two or more trialkoxysilyl groups,the alkaline solution containing at least 0.005M of at least one of the silicate or the silicate or the aluminate,rinsing a metal sheet with the alkaline solution, anddrying the sheet to form a relatively insoluble composite layer containing siloxane.
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Abstract
Painted metal sheet pretreated with an insoluble, composite layer containing siloxane. The composite layer is formed by rinsing the sheet with an alkaline solution containing at least 0.005M of a dissolved silicate or a dissolved aluminate, at least 0.1 vol.-% of an organofunctional silane and at least 0.02 vol.-% of a crosslinking-agent having two or more trialkoxysilyl groups. After the sheet is dried, the composite layer has a thickness of at least 10 Å. After being painted, the siloxane forms a tenacious covalent bond between the paint and the metal substrate.
70 Citations
13 Claims
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1. A method of pretreating metal to improve corrosion resistance, comprising the steps of:
- providing an alkaline solution containing at least one of a dissolved inorganic silicate and a dissolved inorganic aluminate, an organofunctional silane and a crosslinking agent including two or more trialkoxysilyl groups,
the alkaline solution containing at least 0.005M of at least one of the silicate or the silicate or the aluminate, rinsing a metal sheet with the alkaline solution, and drying the sheet to form a relatively insoluble composite layer containing siloxane. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
- providing an alkaline solution containing at least one of a dissolved inorganic silicate and a dissolved inorganic aluminate, an organofunctional silane and a crosslinking agent including two or more trialkoxysilyl groups,
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13. A method of pretreating steel to improve corrosion resistance and paint adhesion, comprising the steps of:
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providing an alkaline solution containing at least at least 0.005M of one of a dissolved inorganic silicate and a dissolved inorganic aluminate, 0.1-5.0 vol.-% of an organofunctional silane, at least 0.1 vol.-% of a crosslinking agent including two or more trialkoxysilyl groups, rinsing a steel sheet with the alkaline solution, drying the sheet to form a relatively insoluble composite layer containing siloxane, and painting the composite layer whereby the siloxane forms an adherent covalent bond between the paint and the steel substrate.
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Specification