Patent ID: 7875318
Filing Date: 2011-01-25
Classification: B05D,C09D,C23C,Y10T

Abstract:
1. A method of coating at least a portion of the exposed surface of a metal that does not contain a chromium sealed zinc phosphate coating, which comprises the steps: a) applying to said surface a curable coating composition consisting essentially of: wherein: each occurrence of R each occurrence of R each occurrence of R each occurrence of R each occurrence of R each occurrence of A each occurrence of the subscripts a, b, c, d, e and f is independently an integer wherein a is 0 to 2; b is 0 to 20; c is 0 or 1; d is 1 to 4; e is 0 or 1; and, f is 1 to 4; and, b) curing the curable coating composition on the surface of the metal to provide an anti-corrosion coating thereon, wherein the curing step is carried out to provide an incompletely cured coating composition possessing a level of condensation of from 60 to 99 percent; and, c) applying a paint to the anti-corrosion coating of step (b) to provide for a metal surface coated therewith exhibiting at least 10 percent decrease in creepage value as measured by ASTM D 1654 compared with the similarly measured creepage value of a metal surface possessing a chromium sealed zinc phosphate coating of a thickness of 0.01 to 5 micrometers and the same paint of a thickness of 0.1 to 100 micrometers.