Process for inhibiting the corrosion of a metal installation in

Details Process for inhibiting the corrosion of a metal installation in Process for inhibiting the corrosion of a metal installation in

1980-09-04

1983-09-06

Smith, William F.

Cleaning and liquid contact with solids

Processes

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

134 18, 134 41, 252 87, 252147, 252148, C23G 106

Patent

active

044027591

ABSTRACT:
The invention relates to a process for inhibiting the corrosion of an installation, made of a material chosen from amongst the metals which are less noble than hydrogen, and their alloys, in contact with an acid bath containing an alkylpyridinium chloride.
A soluble cyanide complex, which is capable of forming an insoluble compound by reacting with ferric ions in the bath, is added to the bath so as to limit the concentration of the ferric ions in the bath to a maximum of 30 mg/kg. The content of ferric ions in the bath is controlled by means of a potentiometric measurement so as to bring the potential of the bath into the region of a predetermined value.
The invention applies in particular to the treatment of baths for cleaning or descaling steel installations.

REFERENCES:
patent: 2831814 (1958-04-01), Chester et al.
patent: 3440170 (1969-04-01), Hek
Chemical Abstracts, vol. 85, 1976, Abstract No. 97486d.
Chemical Abstracts, vol. 76, 1972, p. 142, Abstract No. 5986e.

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