Method for inorganic paint to protect metallic surfaces exposed to moisture, salt and extreme temperatures against corrosion

摘要

A method for inhibiting corrosion of aluminum and other metal-containing surfaces exposed to environmental conditions, including moisture, salt and extreme temperatures, for extended periods. In one embodiment, an aqueous silicate solution is applied to a water break free aluminum alloy surface, forming a silicate protective film on the surface. After the silicate compound protective film dries, an aqueous dichromate solution is applied to the surface, forming a dichromate sealant layer on top of the silicate protective film. The combination of silicate compound protective film and dichromate compound sealant layer provides significant corrosion-inhibiting effects, protecting the underlying metal surface from corrosion for periods more than a year even when the metal surface is exposed to rain, salt fog, and extremes of temperature.