METHOD FOR PROVIDING A CO- AND NI-FREE VITREOUS ENAMELLED METAL COATED STEEL SUBSTRATE AND A PRIMER COMPOSITION THEREFOR

摘要

Method for producing a metal coated steel substrate provided with a coating of a primer composition, comprising applying a layer of the primer composition on the metal coated steel substrate wherein the primer composition comprises basic components selected from the group consisting of CuO, K20, Li20, Na20, Ce02 and ZnO; components with intermediate acidity selected from the group consisting of Al203, B203, Cr203, Sn02 Sb203 and Fe203; acidic components selected from the group consisting of Mn02, Mo03, P205, Si02, Ti02, V205, W03 and Zr02; wherein all wt. % are drawn on the total primer composition and the total sum of the amounts excluding impurities and after normalization is 100 wt. %, wherein all components are expressed as oxides, wherein the sum of the amounts of Ce02+Cr203+CuO+Fe203+Mn02+Mo03+Sn02+Sb203+V205 W03 is between about 16.7 and about 48.6 wt. %.