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Final report on Contract No. 7210-MA/439, 956, 907; 1 July 1993 to 31 December 1996

The aim of the project is the development of an ecological and economical pickling system for stainless steel, suitable for application in continuous strip process lines. The innovative system operates by means of a preferential dissolution under potentiostatic control of the chromium-depleted alloy underneath the oxide scale. Ferrite, austerity and duplex stainless steel grades were used in the laboratory experiments. Samples of both hot-rolled materials were taken from industrial lines after annealing. Potentiostatic pickling parameters in H(2)SO(4)-based pickles were determined including polarisation potential, solution composition and temperature.

The pilot potentiostatic trials demonstrated the feasibility of the potential control of the electro-chemical potential on a strip moving through the pickling cell. The main advantages of the new potentiostatic pickling process are:

- The use of HNO(2)-free solutions.
- High surface quality after pickling.
- Increased pickling rate. g rate.

Additional information

Authors: FERRARI V, CSM, Roma (IT);MATRES SERRANO V, Acerinox S.A., Los Barrios (ES);SYMNIOTIS E, Swedish Institute for Metal Research, Stockholm (SE)
Bibliographic Reference: EUR 20090 EN (2002), pp.84. Euro: 13:00
Availability: EUR-OP reference: KI-NA-20090-EN-S. Available from EUR-OP sales agents. URL:
ISBN: ISBN: 92-828-5190-7
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