Electrolytic pickling of duplex stainless steel
2005 (English)In: Materials and corrosion - Werkstoffe und Korrosion, ISSN 0947-5117, E-ISSN 1521-4176, Vol. 56, no 8, 521-532 p.Article in journal (Refereed) Published
Pickling of duplex stainless steels has proved to be much more difficult than that of standard austenitic grades. Electrolytic pre-pickling is shown to be a key process towards facilitating the pickling process for material annealed both in the production-line and in laboratory experiments. The mechanism for the neutral electrolytic process on duplex 2205 and austenitic 316 steels has been examined and the oxide scale found to become thinner as a function of electrolytic pickling time. Spallation or peeling of the oxide induced by gas evolution did not play a decisive role. A maximum of about 20% of the current supplied to the oxidised steel surface goes to dissolution reactions whereas about 80% of the current was consumed in oxygen gas production. This makes the current utilisation very poor, particularly against the background of reports that in indirect electrolytic pickling only about 30% of the total current, supplied to the process, actually goes into the strip. A parametric study was therefore carried out to determine whether adjustment of process variables could improve the current utilisation.
Place, publisher, year, edition, pages
2005. Vol. 56, no 8, 521-532 p.
Austenite, Decision making, Electrolysis, Peeling, Pickling, Productivity, Spalling, Anode surfaces, Bubble coverage, Duplex stainless steel, Electrolytic pickling
Fluid Mechanics and Acoustics
IdentifiersURN: urn:nbn:se:kth:diva-9007DOI: 10.1002/maco.200403858ISI: 000231329800001OAI: oai:DiVA.org:kth-9007DiVA: diva2:14536
QC 201010252006-01-162006-01-162010-10-25Bibliographically approved