Oxidation resistant ferritic stainless steels

C - Chemistry – Metallurgy – 25 – F

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C25F 3/24 (2006.01) H01M 8/02 (2006.01)

Patent

CA 2535055

A method for making a ferritic stainless steel article having an oxidation resistant surface includes providing a ferritic stainless steel comprising aluminum, at least one rare earth metal and 16 to less than 30 weight percent chromium, wherein the total weight of rare earth metals is greater than 0.02 weight percent. At least one surface of the ferritic stainless steel is modified so that, when subjected to an oxidizing atmosphere at high temperature, the modified surface develops an electrically conductive, aluminum-rich, oxidation resistant oxide scale comprising chromium and iron and a having a hematite structure differing from Fe2O3, alpha Cr2O3 and alpha Al2O3. The modified surface may be provided, for example, by electrochemically modifying the surface, such as by electropolishing the surface.

L'invention concerne un procédé pour la production d'un article en acier ferritique résistant à la corrosion, lequel procédé comporte la production d'un acier ferritique contenant de l'aluminium, au moins un métal des terres rares et 16 à moins de 30 % en poids de chrome, le poids total de métaux de terres rares étant supérieur à 0,02 % en poids. Au moins une surface de l'acier ferritique est modifiée de sorte que, une fois exposée à une atmosphère oxydante à température élevée, la surface modifiée développe une peau oxydée résistante à la corrosion, conductrice d'électricité, riche en aluminium, contenant du chrome et du fer et présentant une structure hématique différente de Fe¿2?O¿3?, alpha Cr¿2?O¿3? et alpha Al¿2?O¿3?. La surface modifiée peut être produite par exemple par modification électrochimique de la surface telle que le polissage électrolytique de la surface.

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