Process for improving the corrosion resistance of ferrous metal

Details Process for improving the corrosion resistance of ferrous metal Process for improving the corrosion resistance of ferrous metal

1983-04-25

1984-05-15

Silverberg, Sam

Metal treatment

Compositions

Heat treating

148 155, C23F 704

Patent

active

044486111

ABSTRACT:
To improve the corrosion resistance of ferrous metal parts containing free r combined sulphur on the surface, the parts are immersed in a bath of molten oxidizing salts at between 350.degree. C. and 450.degree. C., the bath typically having a composition by weight of 60% of potassium hydroxide, 30% of sodium nitrate and 10% of sodium carbonate. Between 0.5% and 15% of oxygen-containing salts, the normal oxidation-reduction potential of which is less than or equal to -1 volt, relative to the hydrogen electrode, such as alkali metal dichromates, permanganates, peroxycarbonates, iodates and periodates, are added to the bath, and an oxygen-containing gas is blown into the bath with an oxygen flow of between 1.5 and 7.5 liters/hour per 100 kg of bath. The molten salts of the bath are filtered continuously through an iron gauze filter cartridge in a furnace, the molten salts being transported into the filter cartridge by entrainment of the salts in a pipe by bubbles of air blown in through the pipe.

REFERENCES:
patent: 2271375 (1942-01-01), MacKay
patent: 2479979 (1949-08-01), Spence
patent: 2537035 (1951-01-01), Clingan
patent: 3847685 (1974-11-01), Baboian
patent: 3915759 (1975-10-01), Smollett
patent: 4055446 (1977-10-01), Kunst et al.
patent: 4292094 (1981-09-01), Kunst

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