Surface treatment method for improving corrosion resistance of f

Metal treatment – Compositions – Heat treating

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C23C 2236

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active

047999705

ABSTRACT:
A surface treatment method for improving the corrosion resistance of a ferrous sintered part, which comprises several steps. One step involves applying a liquid composition containing hexavalent chromium to the surface of the sintered part to form a adhering film of a residue from the liquid composition on the surface of the sintered part. Another step involves performing a high-temperature treatment on the sintered part in an atmosphere containing heated steam to form a dense oxide film on the surface and in the interior of the sintered part in advance of the first mentioned step utilizing the liquid composition for supplying hexavalent chromium. Additionally, or in the alternative a step of impregnating any pores in the residual film with water glass or resin is performed to seal the pores after the step of applying the liquid composition for supplying hexavalent chromium.

REFERENCES:
patent: 3257244 (1966-06-01), Barkman
patent: 3382081 (1968-05-01), Cutter et al.
patent: 3708350 (1973-01-01), Kennedy et al.
patent: 4365003 (1982-12-01), Danforth
patent: 4555445 (1985-11-01), Frey

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