Method of producing metal member with enhanced corrosion...

Details Method of producing metal member with enhanced corrosion... Method of producing metal member with enhanced corrosion...

2007-05-15

2007-05-15

King, Roy (Department: 1742)

Metal treatment

Process of modifying or maintaining internal physical...

Processes of coating utilizing a reactive composition which...

C148S206000

Reexamination Certificate

active

10651978

ABSTRACT:
A metal member is produced with enhanced corrosion resistance by salt bath nitriding. Specifically, in a nitriding salt bath containing Li+, Na+and K+ions as cation components and CNO−and CO3−−ions as anion components and enhanced in oxidizing power by addition of an oxidizing-power-enhancing substance selected from the group consisting of alkali metal hydroxides, bound water, free water and moist air, the metal member is immersed such that an nitrided layer is formed on a surface of the metal member and concurrently, an oxide film is formed on an outermost layer of the nitrided layer. As a subsequent step to the immersion in the nitriding salt bath, the metal member is immersed in a displacement cleansing salt bath which contains an alkali metal nitrate.

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