Aqueous protective and adhesion promoting composition

Details Aqueous protective and adhesion promoting composition Aqueous protective and adhesion promoting composition

C - Chemistry, Metallurgy

09

D

C09D 5/12 (2006.01) B05D 1/36 (2006.01) C09D 4/00 (2006.01) C09D 183/14 (2006.01) C23C 22/08 (2006.01)

Patent

CA 2242256

An aqueous composition for coating a metallic substrate that is prepared by mixing at least one silane (preferably at least two silanes), at least about 20 weight percent phosphoric acid based on the total weight of the composition, and water, wherein the composition is substantially free of an organic solvent and a chromium-containing compound. The pH of the composition must not be above 3. The composition can be coated on a metallic substrate, particularly an aluminum substrate, to provide a pre-treatment layer for adhering overcoats. After rinsing the treated metallic substrate and drying same, an overcoat comprising a primer and/or a topcoat for bonding the metallic substrate to an elastomeric substrate can be applied to the dried metallic substrate.

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