C - Chemistry – Metallurgy – 25 – D
Patent
C - Chemistry, Metallurgy
25
D
C25D 11/02 (2006.01)
Patent
CA 2405485
The invention concerns a method for obtaining a ceramic coating at the surface of a metal, having semiconductor properties, such as aluminium, titanium, magnesium, hafnium, zirconium and their alloys, by physico-chemical reaction transforming the treated metal. Said method consists in immersing the metallic piece (5) to be coated in an electrolytic solution (3) consisting of an aqueous solution of alkali metal hydroxide, such as potassium or sodium, and an alkali metal oxyacid salt, the metallic piece forming one of the electrodes, and in applying to the electrodes a signal generally triangular in shape, that is having at least a front slope and a rear slope, with variable shape factor during the process, generating a current controlled in intensity, its shape and its ratio between positive intensity and negative intensity.
Procédé pour l'obtention d'un revêtement céramique à la surface d'un métal, ayant des propriétés de semi-conducteur, tel qu'aluminium, titane, magnésium, hafnium, zirconium et leurs alliages, par réaction physico-chimique de transformation du métal traité. Ce procédé consiste à immerger la pièce métallique (5) à revêtir dans un bain électrolytique (3) composé d'une solution aqueuse d'hydroxyde de métal alcalin, tel que potassium ou sodium, et d'un sel oxyacide d'un métal alcalin, la pièce métallique formant l'une des électrodes, et à appliquer aux électrodes une tension de signal de forme générale triangulaire, c'est-à-dire présentant au moins une pente avant et une pente arrière, à facteur de forme variable au cours du procédé, engendrant un courant contrôlé dans son intensité, sa forme et son rapport entre l'intensité positive et l'intensité négative.
Beauvir Jacques
Ogilvy Renault Llp/s.e.n.c.r.l.,s.r.l.
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