METHOD FOR MAKING PROTECTIVE COAT Russian patent published in 1994 - IPC

FIELD: corrosion- protecting pipe treatment. SUBSTANCE: a metallic surface is coated with mastic composition comprising 1.0-1.5 parts by weight of benzoic acid and 5 parts by weight of mixture consisting of varnish " КОРПС " prepared from copolymerization product of styrene rectification still residue with maleic anhydride and chrysotile asbestos in varnish-asbestos ratio of 35:65 % by weight followed by drying the resulting coat at temperatures of 50-90 C for 15-20 min. until the full cure. EFFECT: increased corrosion-proof capacity. 2 tbl