Method for pickling or cleaning materials of steel, in particula

Details Method for pickling or cleaning materials of steel, in particula Method for pickling or cleaning materials of steel, in particula

1991-02-05

1992-11-17

Morris, Theodore

Cleaning and liquid contact with solids

Processes

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

134 3, 134 41, 252 794, C23G 108

Patent

active

051640163

ABSTRACT:
Method for pickling or cleaning materials of steel, in particular stainless steel, comprising treating the materials with an aqueous solution containing ferrous ions and ferric ions and an organic acid which does not oxidize the iron in an amount sufficient to maintain the Fe.sup.2+ and Fe.sup.3+ ions in solution, the ferric and ferrous ions being present in the solution in a ration Fe.sup.2+ /Fe.sup.3+ between 10/90 and 40/60, and maintaining the ration Fe.sup.2+ /Fe.sup.3+ within the defined range by addition of hydrogen peroxide.

REFERENCES:
patent: 3873362 (1975-03-01), Mihram et al.
patent: 4389254 (1983-06-01), Tusset et al.
patent: 4636368 (1987-01-01), Pralus

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