良好な接着性を有するコーティング膜を形成する防食剤およびその非ガルバニック塗布のための方法

摘要

Aqueous composition for coating metal substrates comprises a water-soluble or -dispersible polymer that has a concentration gradient of hydrophilic groups along the polymer backbone, has a crosslinking functional group and is covalently bonded to a chelating ligand. Independent claims are also included for: (1) autophoretic application of a composition as above to give a 5-900 nm thick coating; (2) autophoretic application of a composition as above by dipping a substrate in a bath of the composition at 20-90[deg] C for 1 second to 15 minutes; (3) producing an anticorrosion finish on metal substrates by dipping the substrate in a bath of corrosion inhibitor to effect conversion on the substrate surface and then dipping the substrate in a bath of a composition as above.