Method for treating a part made of iron alloy for improving the anti-corrosion properties thereof
AssigneeHydromecanique Et Frottement
InventorsLuc Hermann, Jérémy Barralon, Cédric Meunier
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Abstract
The present invention relates to a method for treating a part (P) made of iron alloy for improving the anti-corrosion and mechanical strength properties thereof, the method comprising: a salt bath nitriding or salt bath nitrocarburising step, to form a combination layer (1) on the part (P), and subsequently a step of phosphating the part (P), to form a phosphating layer (2) on the surface of the part, characterised in that the bath of molten salts contains chlorides, and the phosphating step is carried out in a phosphating bath which contains zinc ions and/or manganese ions, and iron ions.
Claims21
1-13. (canceled)
A method of increasing anti-corrosion and mechanical strength of an iron alloy part, the method comprising:
- forming a combination layer on the iron alloy part by using a nitriding molten salt bath and a nitrocarburising molten salt bath, wherein the nitriding molten salt bath and the nitrocarburising molten salt bath comprise chlorides;
- and
- phosphating the iron alloy part to form a phosphating layer on a surface of the iron alloy part, wherein the phosphating is carried out in a phosphating bath comprising zinc ions and/or manganese ions, and iron ions.
A part made of grey cast iron, comprising:
- a nitriding layer in contact with the grey cast iron, comprising a combination layer containing nitrides;
- and
- a phosphating layer arranged on and in contact with the combination layer, comprising metal phosphates, wherein the metal phosphates comprise zinc, manganese, or a combination thereof, and iron.
Dependencies are inferred from the claim text.