Protective coating

C - Chemistry – Metallurgy – 25 – D

Patent

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C25D 15/00 (2006.01) C25D 15/02 (2006.01) F01D 25/00 (2006.01)

Patent

CA 2172071

A method of producing a coating on a substrate comprises depositing by electrolytic deposition a metal matrix M1 from a bath containing particles of CrAlM2 so as to co-deposit the particles with the matrix, M1 being Ni or Co or Fe or two or all of these elements and M2 being Y, Si, Ti, Hf, Ta, Nb, Mn, Pt, a rare earth element or two or more of these elements, the deposition being carried out at a current density of less than 3 mA per square centimetre. Preferably, the deposition forms a layer less than 50 µm thick, and occurs at a bath loading of less than 40 g/l of the particles.

Procédé de production d'un revêtement sur un substrat consistant à déposer par électrodépôt une matrice métallique M¿1? provenant d'un bain contenant des particules de CrAlM¿2? de manière à déposer en même temps les particules et la matrice, M¿1? pouvant être Ni ou Co ou Fe ou bien deux ou encore tous ces éléments et M¿2? pouvant être Y, Si, Ti, Hf, Ta, Nb, Mn, Pt, un métal des terres rares ou bien deux de ces éléments ou plus; le dépôt étant effectué à une densité de courant inférieure à 3 mA par cm?2¿. Le dépôt forme de préférence une couche d'une épaisseur inférieure à 50 µm et se produit dans des conditions de charge du bain inférieure à 40 g/l de particules.

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