C - Chemistry – Metallurgy – 23 – C
Patent
C - Chemistry, Metallurgy
23
C
C23C 22/48 (2006.01) B21D 22/20 (2006.01) C10M 173/02 (2006.01) C23C 22/50 (2006.01) C23C 22/53 (2006.01) C23C 22/56 (2006.01)
Patent
CA 2632928
The invention relates to a method for the carboxylation conversion of a metal surface under oxidising 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 characterised 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.
Procédé de conversion par carboxylatation d'une surface métallique dans des conditions oxydantes vis-à-vis du métal, par mise en contact avec un bain aqueux ou hydro-organique contenant un mélange d'acides organiques, caractérisé en ce que : - lesdits acides organiques sont des acides carboxyliques linéaires saturés comportant de 10 à 18 atomes de carbone ; - ledit mélange est un mélange binaire ou ternaire de tels acides ; - les proportions respectives de ces acides sont telles que : * pour un mélange binaire x ~ 5% - y ~ 5%, x et y étant, en pourcentages molaires, les proportions respectives des deux acides dans un mélange à la composition de l'eutectique ; * pour un mélange ternaire x ~ 3% - y ~ 3% - z ~ 3%, x, y et z étant, en pourcentage molaire, les propositions respectives des trois acides dans un mélange à la composition de l'eutectique ; - la concentration dudit mélange dans ledit bain est supérieure ou égale à 20 g/l.
Derule Herve
Genet Nicole
Jacques Sophie
Rachiele Lydia
Rocca Emmanuel
Arcelormittal France
Robic
Total France
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