Mar resistant, corrosion inhibiting, weldable coating containing iron powder for metal substrates
First Claim
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1. A mar resistant, weldable, liquid coating composition, which comprises a solvent blend of:
- a) an effective film-forming amount of a resin having crosslinkable functional groups;
b) a crosslinker in an effective amount for curing said resin; and
,c) a weldably effective amount of a welding aid of finely divided non-magnetized iron metal particles naturally oxidized on their surface, randomly dispersed in said liquid coating,said coating being essentially free of ferroalloy and nickel welding aids, and said coating being capable of forming a dry coating film on a metal substrate after curing which is weldable.
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Abstract
A weldable heat curable liquid coating composition for steel is provided that exhibits improved mar resistance without impairing the weldability characteristics of the coating. To this end, the composition contains a conductive welding aid of iron dust. The weldable coating when applied to steel and cured thereon to a dry film allows for spot welding of the coated steel without requiring special welding equipment and techniques.
65 Citations
26 Claims
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1. A mar resistant, weldable, liquid coating composition, which comprises a solvent blend of:
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a) an effective film-forming amount of a resin having crosslinkable functional groups; b) a crosslinker in an effective amount for curing said resin; and
,c) a weldably effective amount of a welding aid of finely divided non-magnetized iron metal particles naturally oxidized on their surface, randomly dispersed in said liquid coating, said coating being essentially free of ferroalloy and nickel welding aids, and said coating being capable of forming a dry coating film on a metal substrate after curing which is weldable. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A mar resistant, weldable, liquid coating composition, which comprises a solvent blend of:
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a) an effective film-forming amount of a resin comprising a mixture of one or more hydroxy-functional polyester resins and one or more epoxy resins; b) an effective amount of a crosslinker for said resin which effects a urethane cure; c) an effective amount of catalyst to accelerate cure; d) a weldably effective amount up to about 50 wt. % of total solids of non-magnetized iron powder particles naturally oxidized on their surface, randomly dispersed in said liquid coating, said iron powder particles comprising irregular spheroids having a particle size below about 100 mesh; e) a pigment in an effective amount to impart color, lightness and opacity to said coating upon curing; f) a suspension agent in an effective amount for suspending said iron powder particles in said liquid coating, said coating being essentially free of ferroalloy and nickel welding aids, and said coating being capable of forming a dry coating film on a metal substrate after curing which is weldable. - View Dependent Claims (14)
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15. A mar resistant, internally lubricated, weldable, liquid coating composition, which comprises a solvent blend of:
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a) an effective film-forming amount of a resin having crosslinkable functional groups; b) a crosslinker in an effective amount for curing said resin into a dry coating film; c) an internal lubricant comprising polytetrafluoroethylene in an effective amount to reduce the coefficient of friction of said dry coating film after curing, and, d) a weldably effective amount of a welding aid of finely divided non-magnetized iron metal particles naturally oxidized on their surface, randomly dispersed in said liquid coating, said coating being essentially free of ferroalloy and nickel welding aids, and said coating being capable of forming a dry coating film on a metal substrate after curing which is weldable. - View Dependent Claims (16, 17, 18, 19, 20, 21, 22, 23, 24, 25)
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26. A mar resistant, internally lubricated, weldable, liquid coating composition, which comprises a solvent blend of:
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a) an effective film-forming amount of a film-forming resin comprising a mixture of one or more hydroxy-functional polyester resins and one or more epoxy resins; b) an effective amount of a crosslinker for said resin which effects a urethane cure; c) a catalyst in an effective amount to accelerate cure; d) a weldably effective amount up to about 50 wt. % of total solids of non-magnetized iron powder particles, naturally oxidized on their surface, randomly dispersed in said liquid coating, said iron powder particles comprising irregular spheroids having a particle size below about 100 mesh; e) a pigment in an effective amount to impart color, lightness and opacity to said coating upon curing; f) an internal lubricant comprising polytetrafluoroethylene in an effective amount to reduce the coefficient of friction of said coating upon curing; and
,g) a suspension agent in an effective amount for suspending said iron powder in said liquid coating, said coating being essentially free of ferroalloy and nickel welding aids, and said coating being capable of forming a dry coating film on a metal substrate after curing which is weldable.
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Specification