Process for pickling a piece of steel and in particular a sheet

Details Process for pickling a piece of steel and in particular a sheet Process for pickling a piece of steel and in particular a sheet

1997-02-27

1998-12-22

Warden, Jill

Cleaning and liquid contact with solids

Processes

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

134 41, C23G 108

Patent

active

058513043

ABSTRACT:
The process comprises applying an aqueous pickling solution containing hydrochloric acid and ferric and ferrous pickling irons in solution, and, for the purpose of maintaining a constant pickling power of the aqueous solution of hydrochloric acid having a pH lower than 1, maintaining the concentration of Fe.sup.3+ ions at a value between 1 g/litre and 300 g/litre, by reoxidation by means of an oxygenation of the Fe.sup.2+ ions produced during the pickling, the REDOX potential being maintained at a value between 0 and 800 mV, the potential being measured between a platinum electrode and a reference AG/AGCl electrode which are placed in the solution.

REFERENCES:
patent: 3310435 (1967-03-01), Robinson, Jr. et al.
patent: 3385734 (1968-05-01), Barkley
patent: 3445284 (1969-05-01), Robinson, Jr. et al.
patent: 4323240 (1982-04-01), Oster
patent: 5164016 (1992-11-01), Henriet et al.
patent: 5332446 (1994-07-01), Didier et al.
JP 55138081, Japanese (Abstract) Dated Oct. 28, 1980.
JP 63216986, Japanese (Abstract), Dated Sep. 9, 1988.
JP 2205692, Japanese (Abstract) Dated Aug. 15, 1990.
JP 58073778, Japan (Abstract) Dated May 4, 1983.

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