C - Chemistry – Metallurgy – 23 – C
Patent
C - Chemistry, Metallurgy
23
C
C23C 22/48 (2006.01) C23C 22/53 (2006.01) C23C 22/56 (2006.01) C23C 22/57 (2006.01)
Patent
CA 2373997
An aqueous acidic solution for forming a conversion coating on the surface of a metallic material, said solution containing at least one rare earth element (as herein defined) containing species, an accelerator additive selected from the group consisting of metals of Group IB, IIB, IVA, VA, VIA and VIII of the Periodic Table, a peroxidic species and at least one acid selected from the group of mineral acids, carboxylic acids, sulphonic acids and phosphonic acids, wherein said solution contains no more than 20 mg/litre each of fluoride and of phosphate, and the solution is essentially free of chromate.
L'invention concerne une solution acide aqueuse destinée à former un revêtement de conversion à la surface d'un matériau métallique, ladite solution contenant une espèce contenant au moins un élément de terres rares (cf. descriptif), un additif accélérateur choisi dans le groupe composé des métaux des groupes IB, IIB, IVA, VA, VIA et VIII de la classification périodique, une espèce peroxydique, et au moins un acide choisi dans le groupe des acides minéraux, des acides carboxyliques, des acides sulphoniques, et des acides phosphoniques. Ladite solution ne contient pas plus de 20 mg/litre de fluor et de phosphates, et est essentiellement libre de chromate.
Hardin Simon Gerard
Hughes Anthony Ewart
Nelson Karen Joy Hammon
Wittel Klaus Werner
Commonwealth Scientific And Industrial Research Organisation
Sim & Mcburney
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