METHOD FOR PRODUCING A SILOXANE COATED METAL SUBSTRATE AND A SILOXANE COATED METAL SUBSTRATE PRODUCED THEREBY

摘要

The present invention relates to a method for providing corrosion protection to a metal substrate, which comprises the steps of applying a sol-gel on the metal substrate and thereafter heating the sol-gel to form a corrosion protective coating, wherein the sol-gel comprises water, a first organofunctional siloxane oligomer and a second organofunctional siloxane oligomer, and wherein the sol-gel is prepared by hydrolysing the first organofunctional siloxane oligomer in a first solution, hydrolysing the second organofunctional siloxane oligomer in a second solution and mixing the first solution and the second solution to form the sol-gel, wherein the pH of the first solution and the second solution is adjusted to an acidic pH.