Surface treatment method for improving corrosion resistance...

Details Surface treatment method for improving corrosion resistance... Surface treatment method for improving corrosion resistance...

C - Chemistry, Metallurgy

23

C

117/92

C23C 8/18 (2006.01) B22F 3/24 (2006.01) C23C 22/24 (2006.01) C23C 22/74 (2006.01)

Patent

CA 1254083

ABSTRACT OF THE DISCLOSURE A surface treatment method is disclosed for improving corrosion resistance of a ferrous sintered part, which method comprises applying a liquid composition con- taining hexavalent chromium to the surface of the sintered part to cause a residue from the liquid composition to adhere to the surface. Prior thereto, the sintered part is subjec- ted to high-temperature treatment in an atmosphere containing heated steam to form a dense oxide film on the surface and in the interior of the sintered part. Alternatively or additionally, the method includes impregnating water glass or resin in pores defined in the residual film to seal the same after the treatment with the liquid composition for supplying hexavalent chromium.

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