Process for the stripping of workpieces and stripping solution

Details Process for the stripping of workpieces and stripping solution Process for the stripping of workpieces and stripping solution

C - Chemistry, Metallurgy

23

F

C23F 1/38 (2006.01) C23F 1/36 (2006.01) C23F 1/44 (2006.01) C23G 1/20 (2006.01) C23G 1/22 (2006.01)

Patent

CA 2723136

A mixture of substances for the stripping of a film from a workpiece consists of an aqueous, alkaline solution which contains between 3 and 8 per cent in weight KMnO4 and at the same time has an alkaline content between 6 and 15 per cent in weight. The alkaline content is formed in one version by KOH or NaOH whereby the pH-value of the solution is above 13. A process in accordance with the invention uses the mixture of substances described above for the wet chemical stripping of hard layers of the group: metallic AlCr, TiAlCr and other AlCr alloys; their nitrides, carbides, borides, oxides or a combination of such.

L'invention concerne un mélange de substances destiné à détacher un système de couches d'une pièce, composé d'une solution alcaline aqueuse contenant de 3 à 8 % en poids de KMnO4 et présentant une fraction alcaline de 6 à 15 % en poids. Dans un mode de réalisation, la fraction alcaline est constituée par KOH ou NaOH, le pH de la solution étant supérieur à 13. Le procédé selon l'invention consiste à employer le mélange de substances décrit pour l'enlèvement chimique par voie humide de couches de substances solides du groupe suivant : AlCr métallique, TiAlCr et d'autres alliages d'AlCr; et leurs nitrures, carbures, borures, oxydes et autres combinaisons.

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