C - Chemistry – Metallurgy – 23 – C
Patent
C - Chemistry, Metallurgy
23
C
C23C 22/48 (2006.01) C23C 22/02 (2006.01) C25D 11/02 (2006.01)
Patent
CA 2442502
The invention relates to a method for treating a metal surface by carboxylation before forming, said metal being selected from zinc, iron, aluminium, copper, lead and the alloys thereof as well as copper-coated, aluminium-coated, galvanised steels. Said method is carried out in oxidising conditions in relation to the metal by bringing said metal into contact with an aqueous, organic or hydro-organic bath comprising at least one organic acid in free form or in salt form. The inventive method is characterised in that: the organic acid is a saturated or unsaturated aliphatic monocarboxylic or dicarboxylic acid; the organic acid is in solution and/or emulsion in the bath at a concentration greater than 0.1 mole/litre; the pH of the bath is acid.
L'invention concerne un procédé de traitement par carboxylatation, avant mise en forme, d'une surface métallique choisie parmi le zinc, le fer, l'aluminium, le cuivre, le plomb, et leurs alliages ainsi que les aciers galvanisés, aluminiés, cuivrés, dans des conditions oxydantes vis à vis du métal, par mise en contact avec un bain aqueux, organique ou hydro-organique comprenant au moins un acide organique sous forme libre ou sous forme de sel, caractérisé en ce que: - ledit acide organique est un acide monocarboxylique ou dicarboxylique aliphatique saturé ou insaturé, - ledit acide organique est en solution et/ou en émulsion dans le bain à une concentration supérieure à 0,1 mole/litre, - le pH du bain est acide.
Derule Herve
Steinmetz Jean
Valot Emeryc
Atofina
Robic
Usinor
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