Anti-corrosive coating
AssigneeThemec Company Incorporated
InventorsRemi Briand, Hylen Keith Freeman
Life of this patent
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Abstract
An improved anti-corrosive zinc coating composition for application on a metal substrate is provided. The coating is comprised of a siloxane polymer resin in combination with zinc dust and ceramic microspheres, the microspheres having diameters of 45 microns or less. At this reduced diameter, the microspheres act as spacers for the zinc particles without interfering with the conductivity of the coating, thereby reducing the amount of zinc necessary to achieve cathodic protection of the substrate. The coating is economical to produce, provides excellent corrosion protection, and resists mud-cracking.
Claims30
An improved anti-corrosive coating comprising by volume:
- about 20 to 40% inorganic polymer resin;
- about 10 to 50% conductive phase;
- and
- about 2 to 50% ceramic microspheres having diameters less than about 50 microns,
- whereby the resulting coating is of sufficient conductivity to inhibit corrosion on a metal substrate.
An improved anti-corrosive coating comprising by volume:
- about 20 to 40% at least one siloxane resin;
- about 10 to 50% conductive phase;
- about 2 to 50% ceramic nicrospberes having diameters less than about 50 microns,
- whereby the result coating is of sufficient conductivity to inhibit corrosion on a metal substrate.
An improved anti-corrosive coating comprising by volume:
- about 20 to 40% prehydrolyzed alkyl silicate resin;
- about 10 to 50% conductive phase;
- about 2 to 50% ceramic microspheres having diameters less than about 50 microns;
- about 6 to 25% at least one organic solvent;
- about 0.1 to 2% at least one wetting agent;
- about 0.1 to 2% at least one anti-sag agent;
- and
- about 1 to 5 % at least one desiccant material, whereby the resulting coating is of sufficient conductivity to inhibit corrosion on a metal substrate.
An improved anti-corrosive coating comprising by volume:
- about 30 to 40% prehydrolyzed alkyl silicate resin;
- about 15 to 35% conductive phase;
- about 10 to 40% ceramic microspheres having diameters less than about 50 microns;
- about 10 to 20% at least one organic solvent;
- about 0.3 to 1.5% at least one wetting agent;
- about 0.3 to 1.5% at least one anti-sag agent;
- and
- about 2 to 4% at least one desiccant material whereby the result coating is of sufficient conductivity to inhibit corrosion on a metal substrate.
An improved cathodic coating comprising:
- a liquid component comprising by total volume;
- about 40.5% liquid prehydrolyzed alkyl silicate;
- about 5.3 1% ethyl alcohol;
- about 8.48% propylene glycol methyl ether acetate;
- about 0.54% wetting agent;
- about 0.60% yellow iron oxide pigment;
- about 0.94% mica;
- about 0.50% fumed silica;
- and
- about 0.60% trimethyl borate;
- in combination with;
- a dry component comprising by total volume;
- about 18.24% zinc dust;
- and
- about 22.13% ceramic microspheres having diameters less than about 50 microns;
- whereby upon mixing the liquid component and the dry component prior to application, the resulting coating is of sufficient conductivity to inhibit corrosion on a metal substrate.
Dependencies are inferred from the claim text.