Method for descaling ferrous metals

Details Method for descaling ferrous metals Method for descaling ferrous metals

1973-11-01

1976-04-20

Bashore, S. Leon

Cleaning and liquid contact with solids

Processes

For metallic, siliceous, or calcareous basework, including...

134 29, 134 30, C23G 114, C23G 128

Patent

active

039516814

ABSTRACT:
A ferrous metal product to be cleaned is immersed in an oxidizing molten salt bath forming a conditioned scale on the surface of the metal. The conditioned scale is subsequently removed from the metal surface by immersing the metal product in an aqueous caustic bath containing alkali metal hydroxide with alkali gluconate and triethanolamine serving as sequestering agents. The caustic bath may optionally include a brightening catalyst or ethylenediamine-tetracetic acid.

REFERENCES:
patent: 2458661 (1949-01-01), Webster et al.
patent: 2828193 (1958-03-01), Newman
patent: 3446715 (1969-05-01), Frey
patent: 3506487 (1970-04-01), Lenz et al.
patent: 3553015 (1971-01-01), Dohogne
patent: 3847663 (1974-11-01), Shumaker
Metals Handbook, 8th Edition, Vol. 2, 1964, pp. 312, 356-359, 600-601.
Loucks, "Boosting Capacities with Chemicals", Chemical Engineering, 2/26/73, pp. 79-81.
Metallurgia, Durkin--"How to Descale Titanium", 1954, p. 256.

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