Inhibited metal pigment pastes containing molybdate pigments and suitable for aqueous coating compositions
AssigneeSilberline Manufacturing Co., Inc.
InventorsCraig B. Keemer, William G. Jenkins, H. Taylor Lamborn, Robert E. Souerwine
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Abstract
Metal particles useful for coating compositions, particularly aqueous coating compositions, are produced by treating the metal particles with a molybdate pigment. The molybdate pigment reacts with the surface of the metal particles. The molybdate pigment may be a salt such as a molybdate, phosphomolybdate or silicomolybdate salt, and the salt may include a multivalent cation such as calcium, strontium, barium, magnesium, zinc and aluminum. The metal particles show improved resistance to attack by water.
Claims16
A metallic particle paste for forming a coating composition, comprising:
- 40-90% by weight of metal particles treated with a corrosion-inhibiting molybdate pigment;
- and
- a solvent,
- said corrosion-inhibiting molybdate pigment being an inorganic salt consisting of molybdate anion and at least one cation selected from the group consisting of calcium, barium, strontium, magnesium, zinc and aluminum.
A method of making a metallic particle paste for forming a coating composition that comprises 40-90% by weight of metal particles treated with a corrosion-inhibiting molybdate pigment;
- and a solvent, said corrosion-inhibiting molybdate pigment being an inorganic salt consisting of molybdate anion and at least one cation selected from the group consisting of calcium, barium, strontium, magnesium, zinc and aluminum, the method comprising
- contacting the metal particles with the corrosion-inhibiting molybdate pigment, in a liquid medium.
A metal particle suitable for use in a coating composition, having a surface reacted chemically with a corrosion-inhibiting molybdate pigment that is an inorganic salt consisting of molybdate anion and at least one cation selected from the group consisting of calcium, barium, strontium, magnesium, zinc and aluminum.
In a painted article, the improvement wherein the article is painted with a coating composition comprising a metal particle treated with a corrosion-inhibiting molybdate pigment that is an inorganic salt consisting of molybdate anion and at least one cation selected from the group consisting of calcium, barium, strontium, magnesium, zinc and aluminum.
Dependencies are inferred from the claim text.