Aqueous epoxy resin compositions and metal substrates coated therewith

摘要: This invention relates to aqueous epoxy resin-containing compositions and such which are particularly useful for depositing coatings on metallic substrates in order protect against corrosion. The generally comprise (A) an organic resin component consisting essentially of at least one water-dispersible or emulsifiable a mixture resins containing more than 50% by weight resin, (B) chromium trioxide, (C) water, said composition further characterized as being substantially free strontium chromate. may also contain other ingredients including zinc and/or ferro alloys. These pretreatment metal surfaces, particular, steel galvanized aluminized substrates. coating can then be coated with weldable non-weldable primer followed the application decorative topcoats appliance automotive topcoats. have been and, optionally, coatings.