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AssigneesArcelorMittal France, Total France
InventorsHerve Derule, Lydia Rachiele, Sophie Jacques, Nicole Genet, Jean Steinmetz, Emmanuel Rocca
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The invention relates to a method for the carboxylation conversion of a metal surface under oxidizing conditions in relation to the metal, consisting in bringing the metal into contact with a hydro-organic or aqueous bath containing a mixture of organic acids. The invention is characterized in that; the organic acids comprise saturated linear carboxylic acids having between 10 and 18 carbon atoms; the mixture comprises a binary or ternary mixture of such acids; the respective proportions of said acids are such that (i) for a binary mixture x±5%−y±5%, wherein x and y represent the respective proportions, in molar percentages, of the two acids in a mixture with the composition of the eutectic and (ii) for a ternary mixture x±3%−y±3%−z±3%, wherein x, y and z represent the respective proportions, in molar percentages, of the three acids in a mixture with the composition of the eutectic; and the concentration of the mixture in the bath is greater than or equal to 20 g/l.
A method of conversion by carboxylation of a metal surface selected from the group consisting of zinc, iron, aluminium, copper, lead and their alloys, and galvanized, electrozinced, aluminized, and copper-plated steels, under oxidizing conditions in relation to the metal surface, by bringing said metal surface into contact with a aqueous or hydro-organic bath containing a mixture of organic acids, said mixture being such that:
Dependencies are inferred from the claim text.