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Enhanced Picking of High Alloyed Stainless Steels

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Objectives and content

Pickling is a common industrial process, employed by a wide range of industries to clean many different types of component, manufactured in different metal alloys. Current pickling techniques for highly alloyed stainless steels, while reasonably satisfactory technically, are slow, expensive and cause a number of environmental problems. Manufacturers of castings and tubes requiring long, high temperature heat treatments, are under considerable legislative and economic pressure. Environmental difficulties are primarily associated with disposal of the "spent" pickle liquor. Economic pressures largely arise due the long pickling times, up to 30 hours, required to remove thick oxide films and up to 0.5mm of the surface metal, the latter due to chromium depletion and/or contamination with carbon and/or sulphur.
It is proposed to investigate the use of combined alternating and direct current, ac and dc, during electrolytic pickling. It has been shown that ac can have a range of effects on specific electrochemical processes, for example corrosion, electrochemical machining, electrolysis and briefly pickling. The effect of ac can be to accelerate or slow down particular electrochemical processes.

The nature and extent of the effect has been shown to be predictable from the study of the electrochemical behaviour of any metal electrolyte combination. In the case of corrosion, potentiodynamic polarisation curves produced in the presence of ac have been used to accurately predict the extent of the effect of imposed ac. These techniques will be developed to study the pickling process.

The aim of the project will-be to develop new pickling processes that use electrolytes that are more readily disposed of and significantly reduce the time required with existing processes.

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Finanzierungsplan

CSC - Cost-sharing contracts

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EA TECHNOLOGY LTD.
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Capenhurst
CHESTER
Vereinigtes Königreich

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Letzte Aktualisierung: 26 Juni 1997

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Permalink: https://cordis.europa.eu/project/id/BRPR950018/de

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