METALLIC ARTICLES HAVING VITREOUS OR GLASS-CERAMIC PIGMENTED PROTECTIVE LAYERS

摘要

Metallic substrates having a vitreous or glass-ceramic pigmented protective layer can be obtained by applying a coating sol containing an alkali metal silicate to the substrate or a surface thereof and thermal densification of the layer obtained in this way, where the coating sol containing alkali metal silicate contains an oxidic pigment derived from at least one element selected from the third and fourth main or transition groups of the Periodic Table of the chemical elements and the transition metals Fe, Co, Ni, Cu, Zn, Nb and Ta.