| http://www.w3.org/ns/prov#value | - A method according to claim 13, including dipping a zinccontaining metal in an aqueous solution comprised of silicate ions and aluminium ions, and optionally including cerium ions, to form a diffusion layer at the metal surface, and for a time sufficient for an aluminosilicate coating to form on the metal surface, the formed aluminosilicate coating including within its structure zinc ions diffused
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