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US 6,440,580 B1Granted
Weldable, coated metal substrates and methods for preparing and inhibiting corrosion of the same
AssigneePPG Industries Ohio, Inc.
InventorsValentin Berger, Ralph C. Gray, Richard M. Nugent, Jr., Michael J. Pawlik
Life of this patent
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Abstract
The present invention provides a weldable, coated metal substrate having a pretreatment coating including a reaction product of at least one epoxy-functional material and at least one phosphorus-containing material or amine-containing material and a weldable coating having an electroconductive pigment and a binder deposited thereon.
Claims28
A weldable, coated metal substrate comprising:
- (a) a bare metal substrate;
- (b) a pretreatment coating having less than 0.05 weight percent of chromium-containing materials, the pretreatment coating comprising a β-hydroxy phosphorous ester that is the reaction product of at least one epoxy-functional material and a phosphorus-containing material deposited upon at least a portion of a surface of the metal substrate;
- and
- (c) a weldable coating comprising an electroconductive pigment and a binder deposited upon at least a portion of the pretreatment coating.
1 more element
A weldable, coated metal substrate comprising:
- (a) a bare metal substrate;
- (b) a pretreatment coating having less than 0.05 weight percent of chromium-containing materials, the pretreatment coating comprising a reaction product of at least one epoxy-functional material and a phosphorus-containing material deposited upon at least a portion of a surface of the metal substrate;
- and
- (c) a weldable coating comprising an electroconductive pigment and a binder deposited upon at least a portion of the pretreatment coating, wherein the epoxy functional material is a polyglycidyl ether of bisphenol A.
1 more element
Dependencies are inferred from the claim text.