Metal treatment – Compositions – Heat treating
Patent
1984-11-05
1986-06-24
O'Keefe, Veronica
Metal treatment
Compositions
Heat treating
148 6, 148 166, 148 15, 148 155, 148 14, 148 16, 148 315, C23C 1114
Patent
active
045966117
ABSTRACT:
A non-alloy steel component is nitrocarburized at 550.degree. to 720.degree. C. for up to 4 hours in a nitriding gaseous atmosphere e.g. ammonia or ammonia and endothermic or exothermic gas, and is thus exposed to air or other oxidizing atmosphere for 2 to 120 seconds to form an oxide-rich layer thereon before being quenched into an oil/water emulsion, degreased and a tack-free wax coating applied. Alternatively, the component may be cooled in air or other oxidizing atmosphere and then wax coated or it may be cooled in a non-oxidizing atmosphere and then reheated to provide the oxide-rich surface layer before being cooled again and wax coated. As a further alternative, the component may be cooled, lapped to a surface roughness of not more than 0.2 micrometers Ra, reheated to oxidize and then quenched. These techniques give a good corrosion resistance to the component.
REFERENCES:
patent: 3479229 (1969-11-01), Becker
patent: 4062701 (1977-12-01), Juhas
patent: 4131492 (1978-12-01), Fushimi et al.
patent: 4477293 (1984-10-01), Timmis
The Oxidation and Corrosion Resistance of Nitride Iron Alloys, D. J. Coates.
Das Oxidieren und Phosphatieren von Metallen--Jampolski, pp. 34 and 35.
Dawes Cyril
Smith John D.
Lucas Industries
O'Keefe Veronica
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