Chromium-free coating preparation for the treatment of metal surfaces and method making use thereof

摘要

An aqueous chromium-free coating preparation for the protection of a metal substrate against corrosion and attack by moisture comprises an acrylic acid or derivative thereof as binder and also a crosslinking system which comprises at least one hydroxide of a divalent metal ion and an amine compound. The acrylic acid:crosslinking system ratio is generally 1.5-4:2-4. The crosslinking system may comprise other monofunctional or polyfunctional compounds. Various constituents of the crosslinking system can be interchanged within certain margins./!