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US 2021/0054216 A1Published application
Coating compositions exhibiting corrosion resistance properties and related coated substrates
AssigneePPG Industries Ohio, Inc.
InventorsDavid N. Walters, John R. Schneider
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Abstract
Coating compositions are disclosed that include corrosion resisting particles such that the coating composition can exhibit corrosion resistance properties. Also disclosed are substrates at least partially coated with a coating deposited from such a composition and multi-component composite coatings, wherein at least one coating later is deposited from such a coating composition. Methods and apparatus for making ultrafine solid particles are also disclosed.
Claims37
A coating composition comprising:
- (a) a thermosetting composition comprising a polyamine and an epoxy functional material;
- and
- (b) magnesium oxide particles having a BET surface area of no more than 250 m2/g and a calculated equivalent spherical diameter (D(nm)) of no more than 200 nanometers, wherein the calculated spherical diameter (D(nm)) is determined according to the equation:
- D(nm)=6000/[BET (m2/g)*ρ(grams/cm)], wherein BET represents surface area as determined by nitrogen adsorption according to the ASTMD 3663-78 standard based on the Brunauer-Emmett-Teller method and p represents density,
- wherein the magnesium oxide particles act as a corrosion resisting material.
2 more elements
A method of coating a substrate comprising:
- applying a first coating composition to at least a portion of the substrate, the first coating composition comprising a thermosetting composition comprising a polyamine, an epoxy functional material, and magnesium oxide particles having a BET surface area of no more than 250 m2/g and a calculated equivalent spherical diameter (D(nm)) of no more than 200 nanometers, wherein the calculated spherical diameter (D(nm)) is determined according to the equation:
- D(nm)=6000/[BET (m2/g)*ρ(grams/cm3)], wherein BET represents surface area as determined by nitrogen adsorption according to the ASTMD 3663-78 standard based on the Brunauer-Emmett-Teller method and p represents density,
- wherein the magnesium oxide particles act as a corrosion resisting material.
A coated substrate comprising:
- (a) an aluminum alloy;
- and
- (b) a cured thermoset first coating on at least a portion of the surface of the aluminum alloy that is deposited from a first coating composition comprising a polyamine, an epoxy functional material, and magnesium oxide particles having a BET surface area of no more than 250 m2/g and a calculated equivalent spherical diameter (D(nm)) of no more than 200 nanometers, wherein the calculated spherical diameter (D(nm)) is determined according to the equation:
- D(nm)=6000/[BET (m2/g)*ρ(grams/cm3)], wherein BET represents surface area as determined by nitrogen adsorption according to the ASTMD 3663-78 standard based on the Brunauer-Emmett-Teller method and p represents density, wherein the magnesium oxide particles act as a corrosion resisting material.
1 more element
Dependencies are inferred from the claim text.