Mildly alkaline thin inorganic corrosion protective coating for metal substrates

摘要

Disclosed is a neutral to alkaline inorganic conversion coating composition that can be applied directly to a metal surface without a phosphatizing pre-treatment and that provides significant corrosion protection to the surface. The coating composition is very versatile and can accommodate addition of a wide variety of organic polymers which can be added directly to the coating composition thus eliminating multistep coating processes.

主权项

1. A dried in place corrosion protective coating deposited on a metal substrate, said coating having a morphology comprising:
a continuous phase consisting of an inorganic phase, said inorganic phase consisting essentially of at least one element from group IVB of the Periodic Table present in an amount of from 9 to 73% by weight, based on total dry solids coating weight; and a discontinuous phase consisting of an organic phase, said organic phase consisting essentially of solids of one or more organic polymers, said one or more organic polymers present in an amount of from 1% to 75% by weight based on total dry solids coating weight and shaped as a plurality of discrete polymer spheres dispersed in the continuous inorganic phase, said spheres having an average particle size of from 111 to 137 nanometers and wherein said one or more organic polymers are selected from the group consisting of a polyvinyl dichloride resin, an acrylic-based resin, a methacrylate-based resin, a styrene-based resin, and a mixture thereof; and wherein said continuous phase optionally includes at least one element from group VB of the Periodic Table, and wherein said coating optionally includes a reducing agent for said at least one element from group VB.