Abstract: Improved zinc-containing coating compositions are useful to protect ferrous-containing surfaces. They are particularly useful and highly protective against red rust. The compositions with higher zinc content can be used to provide preferably a thinner coating. The compositions contain preferably; metallic zinc in particulate form, e.g., zinc dust or zinc flake; a polyol silicate a residual polyol or polyol polymer, and an inhibitor pigment selected from an alkaline earth chromate, a comixture of zinc chromate and one or more of the finely divided silicates, carbonates, oxides, hydroxides, and sparingly soluble compounds of magnesium and calcium, a comixture selected from a metal chromate.sup.-3 compound which metal is not lower than iron in the electrochemical series-plus a sparingly soluble metal compound filler which metal is also not lower than iron in the electrochemical series.

Abstract: Improved zinc-containing coating compositions are useful to protect ferrous-containing surfaces. They are particularly useful and highly protective against red rust. The compositions with higher zinc content can be used as very thin coatings. Those having lower zinc content are used to provide preferably a thicker coating. The compositions contain: metallic zinc in particulate form, e.g., zinc dust or zinc flake; a polyol silicate; an inhibitor pigment selected from a chromate composition (selected from strontium chromate, calcium chromate, barium chromate, a mixture of zinc chromate and zinc oxide or hydroxide, a mixture of zinc chloride and strontium chromate, a mixture of zinc chloride and strontium chromate and chromium oxide green), zinc phosphate, barium metaborate, calcium borosilicate, and a mixture of red lead oxide and calcium carbonate; and a liquid organic vehicle.

Abstract: Improved zinc-containing coating compositions are useful to protect ferrous-containing surfaces. They are particularly useful and highly protective against red rust. The compositions with higher zinc content can be used as very thin coatings. Those having lower zinc content are used to provide preferably a thicker coating. The compositions contain: metallic zinc in particulate form, e.g., zinc dust or zinc flake; a polyol silicate; a chromate composition selected from strontium chromate, calcium chromate, barium chromate, lead chromate plus lead sulfate (chrome yellow & primrose) and a mixture of zinc chromate and zinc oxide or hydroxide; and a liquid organic vehicle. When zinc dust is used as the particulate zinc, finely divided inert extenders, such as iron phosphide, may be incorporated in the composition; in such composition the zinc content of the combination can be lower without impairing the protective action provided by a coating of the composition.

Abstract: Protective coating compositions are prepared comprising aliphatic polyol-derived silicates and zinc dust as a filler. The compositions provide long-life protection for ferrous substrates against rusting in moist and salty atmospheres. The zinc filler 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 filler and the aliphatic polyol-derived silicates with solvents, and with or without other fillers or organic polymeric materials are especially useful as coatings. A range of aliphatic polyol to total alkyl-type or alkoxyalkyl-type silicate reacted in making the polyol-derived silicates is about 0.15 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 silicate reactants having up to, for instance, an average of 5 or 6 SiO.sub.

Abstract: Protective coating compositions are prepared comprising aliphatic polyol-derived silicates and zinc dust as a filler. The compositions provide long-life protection for ferrous substrates against rusting in moist and salty atmospheres. The zinc filler 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 filler and the aliphatic polyol-derived silicates with solvents, and with or without other fillers or organic polymeric materials are especially useful as coatings. A range of aliphatic polyol to total alkyl-type or alkoxyalkyl-type silicate reacted in making the polyol-derived silicates is about 0.15 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 silicate reactants having up to, for instance, an average of 5 to 6 SiO.sub.