Method of nitriding ferrous metal parts having improved corrosio

Details Method of nitriding ferrous metal parts having improved corrosio Method of nitriding ferrous metal parts having improved corrosio

1994-07-22

1996-05-21

Niebling, John

Electrolysis: processes, compositions used therein, and methods

Electrolytic coating

Agitating or moving electrolyte during coating

205231, 205320, C25D 520, C25D 2110, C25D 366, C25D 900

Patent

active

055186050

ABSTRACT:
In a nitriding method intended to confer upon ferrous metal parts, in addon to surface properties resulting directly from nitriding, corrosion resistance comparable to that obtained when the nitriding treatment is followed by an oxidizing treatment, in particular in a salt bath, the parts are treated by immersion for an appropriate time in a molten salt bath containing in the known manner essentially alkali metal carbonates and cyanates and a small quantity of a sulfur-containing substance. The parts are held at a positive potential relative to a counter-electrode in contact with the bath so that a high current flows through the bath from the parts to the counter-electrode and the concentration of cyanides formed by secondary reaction is kept below 6%. It is preferable to use a constant average current; the typical current densities are from 300 amperes to 800 amperes per m.sup.2, the typical temperature ranges are from 450.degree. C. to 650.degree. C. and the typical treatment times are from 10 minutes to 150 minutes.

REFERENCES:
patent: 3912547 (1975-10-01), Gaucher et al.
patent: 4006043 (1977-02-01), Gaucher et al.
patent: 4448611 (1984-05-01), Grellet et al.

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