Galvanic coating compositions comprising polyol silcates and zinc dust

摘要

Galvanically-protective coating compositions are prepared comprising polyol silicates and zinc dust. The compositions provide long-life protection for steel against rusting in moist and salty atmospheres. The zinc and silicate components may be compounded in one package or as two packages to be mixed prior to application as a film. Compositions comprising zinc and the polyol silicates with solvents, and with or without fillers or organic polymeric materials are especially useful as coatings. The range of polyol to organic silicate employed in making the polyol silicates is about 0.05 to 1.8 moles of reactive OH grouping supplied by the polyol per mole of ester-exchangeable group in the silicates the larger ratios being especially useful for the monomer type silicates and decreasing as the ¦¦ -Si-O-Si ¦¦ CONTENT INCREASES.