CORROSION RESISTANT STEEL COMPONENTS AND METHOD OF MANUFACTURE THEREOF

To impart good salt spray corrosion resistance to alloy steel components, such components are gas nitrocarburised at 550 DEG C to 800 DEG C to produce an epsilon layer oxidised to produce an Fe3O4 layer not more than 1 micrometre thick, quenched into an oil/water emulsion, degreased and then wax coa...

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Bibliographische Detailangaben
Hauptverfasser:	DAWES, CYRIL, SMITH, JOHN DAVID, SMITH, COLIN GEORGE
Format:	Patent
Sprache:	eng
Schlagworte:	CHEMICAL SURFACE TREATMENT CHEMISTRY COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATIONOR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY IONIMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL COATING MATERIAL WITH METALLIC MATERIAL COATING METALLIC MATERIAL DIFFUSION TREATMENT OF METALLIC MATERIAL INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION INGENERAL METALLURGY SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THESURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION
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Beschreibung
Zusammenfassung:	To impart good salt spray corrosion resistance to alloy steel components, such components are gas nitrocarburised at 550 DEG C to 800 DEG C to produce an epsilon layer oxidised to produce an Fe3O4 layer not more than 1 micrometre thick, quenched into an oil/water emulsion, degreased and then wax coated. The steel components may be surface finished after nitrocarburising. A carburizing or carbonitriding or neutral atmosphere heat treatment is effected prior to nitrocarburising heat treatment heat treatment with both heat treatments being effected at above the pearlite to austenite transformation temperature.