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Title:
BLACKENING OF SURFACE OF STEEL METAL PRODUCT
Document Type and Number:
Japanese Patent JPS5456949
Kind Code:
A
Abstract:
The surfaces of a ferrous metal body are coated with a heat-fusible, chemically-oxidizing composition, such as sodium nitrate or potassium nitrate. Then, the coated body is heated above the melting temperature of the coating, preferably above 350 DEG C., until the coating melts, spreads over the surfaces, reacts with the material of the surfaces and produces a black oxide coating thereon.

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Inventors:
EERU SOROMON TAARU
JIYON JIYOSEFU MASUKONII
Application Number:
JP11644578A
Publication Date:
May 08, 1979
Filing Date:
September 20, 1978
Export Citation:
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Assignee:
RCA CORP
International Classes:
C23C22/72; H01J9/14; (IPC1-7): C23F7/04
Domestic Patent References:
JP44005287A
JPS5311132A1978-02-01



 
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