Epoxy corrosion-inhibiting coating composition
First Claim
1. An aqueous composition comprising:
- an organic resin component consisting essentially of at least one water-dispersible or emulsifiable epoxy resin or a mixture of resins containing more than 50% by weight of at least one water-dispersible or emulsifiable epoxy resin, chromium trioxide, water, phosphoric acid or an alkylphosphoric acid, and a lubricant consisting essentially of polytetrafluoroethylene.
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Accused Products
Abstract
This invention relates to aqueous epoxy resin-containing compositions and to such compositions which are particularly useful for depositing coatings on metalic substrates in order to protect substrates against corrosion. The aqueous compositions generally comprise (A) an organic resin component consisting essentially of at least one water-dispersible or emulsifiable epoxy resin or a mixture of resins containing more than 50% by weight of at least one water-dispersible or emulsifiable epoxy resin, (B) chromium trioxide, and (C) water, said composition further characterized as being substantially free of strontium chromate. The aqueous compositions may also contain other ingredients including zinc and/or ferro alloys, and polytetrafluoroethylene as a lubricant to aid metal stamping operations, and a soluble colorant.
55 Citations
15 Claims
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1. An aqueous composition comprising:
an organic resin component consisting essentially of at least one water-dispersible or emulsifiable epoxy resin or a mixture of resins containing more than 50% by weight of at least one water-dispersible or emulsifiable epoxy resin, chromium trioxide, water, phosphoric acid or an alkylphosphoric acid, and a lubricant consisting essentially of polytetrafluoroethylene. - View Dependent Claims (2, 3, 4)
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5. An aqueous composition comprising:
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from about 2 to about 25% by weight of an organic resin component consisting essentially of at least one water-dipersible or emulsifiable epoxy resin or a mixture of resins containing more than 50% by weight of at least one water-dispersible or emulsifiable epoxy resin, from about 0.5 to about 5% by weight of chromium trioxide, from about 25 to about 97% by weight of water, phosphoric acid or an alkyl phosphoric acid, and polytetrafluoroethylene, said composition further characterized as being substantially free of strontium chromate. - View Dependent Claims (6, 7, 8)
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9. An aqueous composition comprising:
at least one water-dispersible or emulsifiable epoxy resin, chromium trioxide, water, phosphoric acid or an alkylphosphoric acid, zinc powder or a ferro alloy powder or mixtures thereof, and a lubricant consisting essentially of polytetrafluoroethylene. - View Dependent Claims (10, 11)
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12. A corrosion-inhibiting coating composition comprising:
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a thermosetting organic resin; a corrosion inhibiting agent selected from the group consisting of a convertible chromium compound, phosphoric acid or a salt or ester thereof, or a mixture of two or more of said inhibitors; and
a lubricant consisting essentially of polytetrafluoroethylene. - View Dependent Claims (13, 14)
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15. An aqueous composition comprising:
at least one water-dispersible or emulsifiable thermosetting organic resin, water, phosphoric acid or an alkylphosphoric acid, a reducible source of trivalent chromium, a lubricant consisting essentially of polytetrafluoroethylene, and a solvent dye.
Specification