STEEL SHEET WITH PORCELAIN-ENAMEL COATING AND FRITS FOR ENAMELLING Russian patent published in 2003 - IPC

FIELD: coating application by enamelling. SUBSTANCE: steel sheet with porcelain-enamel coating consists of steel sheet electroplated with aluminum-zinc alloy and layer of porcelain-enamel coating in the form of the uppermost layer of steel sheet in which intermediate layer having good adhesion to electroplated layer and to layer of enamel coating, presents interlayer between said two layers. Intermediate layer preferably presents component selected from group including surface layer on layer of coating electroplated with aluminum-zinc alloy, where aluminum content amounts to at least 96 wt.%; surface layer on said layer of electroplated with coating of aluminum-zinc alloy which contains aluminum, nickel and not more 1 wt.% of zinc; coating layer consisting of at least one component selected from group including Ni. Co, Mo, Mn, Ni-P, Ni-Co-P and Co-P; chromate layer; coating layer consisting of at least one component selected from group including zinc phosphate, manganese phosphate and aluminum phosphate. Steel sheet with porcelain-enamel coating features, both high corrosion resistance and properties characterizing strength of cohesion of enamel to provide for use of various operating conditions, particularly, in bending working of steel sheet. EFFECT: higher efficiency of use. 3 cl, 1 dwg, 12 tbl