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Abstract

There is disclosed the coating of a metallic substrate with a cross-linked polymeric film by contacting the substrate with an aqueous composition containing: at least an acrylic or metacrylic compound which can be defined by the general formula: ##STR1## wherein: R is a straight-line or branched aliphatic hydrocarbon radical, either saturated or unsaturated containing from 2 to 10 carbon atoms, or a cycloaliphatic or an aromatic group; R.sub.1 and R.sub.2, equal to or different from one another, are straight-line or branched alkyl groups, either saturated or unsaturated and containing from 1 to 8 carbon atoms, or cycloaliphatic or aromatic groups; at least one unsaturated organic acid capable of being copolymerized with the compound (I), in an amount of from 5 to 40 parts by weight per 100 parts of the compound (I) or an organic or a mineral acid which cannot be copolymerized with the compound (I) in an amount of from 1 to 10 parts by weight per 100 parts of the compound (I), and a polymerization catalyst preferably selected from among the persulphates, the hydroperoxides, the peracids H.sub.2 O.sub.2 and the peroxides. A metallic substrate coated by the composition of polymeric nature as described above is then heated to a temperature equal to, or lower than 180.degree. C. approximately and for the time which is necessary to originate a polymeric film cross-linked upon said substrate. A film so deposited exhibits optimum properties as to adherence, resistance to bending and shocks and resistance to the saline mist.

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First Claim