Aluminum deoxidizing inhibitor, composition and process

C - Chemistry – Metallurgy – 09 – K

Patent

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C09K 13/10 (2006.01) C23F 1/20 (2006.01) C23G 1/12 (2006.01)

Patent

CA 2242881

A chromium-and-ferricyanide-free aqueous cleaner/deoxidizer for aluminum, the cleaner/deoxidizer having an etch rate on titanium that is low enough for practical use in processes where aluminum objects to be deoxidized are held on titanium racks or hangers during the process, combines boric acid, fluoborate anions, and an acid that is stronger than either of boric and fluoboric acids, usually also with an oxidizing agent such as hydrogen peroxide. Rates of etching of aluminum that are at least as much as 50 times the rates of etching of titanium under the same conditions can be achieved, and the deoxidizing of the aluminum is satisfactory for achieving corrosion resistance after subsequent conversion coating of the deoxidized aluminum surface.

Cette invention concerne un nettoyant/désoxydant aqueux pour l'aluminium, lequel ne contient pas de chrome ni de ferricyanure, et possède une vitesse d'attaque sur le titane suffisamment basse pour que l'on puisse l'utiliser, lors d'applications pratiques, dans des processus où des objets en aluminium devant être désoxydés sont maintenus à l'aide de râteliers ou de supports en titane. Ce nettoyant/désoxydant se compose d'une combinaison d'acide borique, d'anions de fluoroborate, d'un acide plus fort qu'un acide borique ou qu'un acide fluoroborique et, en général, d'un agent oxydant tel que du peroxyde d'hydrogène. Il est ainsi possible d'obtenir des vitesses d'attaque de l'aluminium au moins 50 fois supérieures aux vitesses d'attaque du titane dans des conditions identiques, cette désoxydation de l'aluminium étant suffisante pour obtenir une résistance à la corrosion après l'application d'un revêtement de conversion sur la surface d'aluminium désoxydé.

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