The invention pertains to an aqueous coating composition comprising: - an aqueous latex of a copolymer consisting essentially of recurrent units derived from (i) vinylidene chloride (vdc), (ii) vinyl chloride (vc), (iii) one or more than one alkyl (meth) acrylate having from 1 to 12 carbon atoms in the alkyl group [monomer (ma)] and (iv) one or more than one unsaturated alpha-beta aliphatic carboxylic acid [monomer ( aa)], the proportion of recurrent monomer-derived units (aa) being at least 1.0% by weight, with respect to the total weight of the copolymer [copolymer (a)], wherein: (a) said copolymer ( (a) is stable against dehydrochlorination, in such a way that the total chloride content of the solid residue of the aqueous latex after heat treatment at about 120 ° C for 2 hours is less than 1000 ppm with respect to weight total copolymer (a); (b) said copolymer (a) undergoes no significant crystallization during heating, in such a manner that the ratio of (j) its crystallinity index (ci) after heat treatment involving heating at 60 ° C for 48 hours. hours for (jj) its crystallinity index prior to such heat treatment (ci after heat treatment / prior to heat treatment) is less than 1.15; and at least one anti-corrosion pigment comprising an aluminum salt of a (poly) phosphoric acid modified with an alkaline earth metal oxide.
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