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Simple analytical model predicting some features of the electrolytic steel-pickling process
KTH, School of Engineering Sciences (SCI), Centres, Faxén Laboratory. KTH, Superseded Departments, Mechanics.
University of Pennsylvania, Dept. Mech. Eng. and Appl. Mechanics.
KTH, School of Engineering Sciences (SCI), Centres, Faxén Laboratory. KTH, Superseded Departments, Mechanics.
Avesta Sheffield AB.
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2002 (English)In: Russian journal of electrochemistry, ISSN 1023-1935, E-ISSN 1608-3342, Vol. 38, no 3, 238-246 p.Article in journal (Refereed) Published
Abstract [en]

Electrolytic pickling of steel with neutral solutions, to remove the surface scale, reduces the need for the use of strong acids as needed in conventional pickling. This study is a step towards a more in-depth understanding of the factors affecting the former process. A theoretical model, sufficiently simplified to allow analytical solution, is developed and evaluated to provide a first approximation of the potential and current distributions in the electrolyte and steel band. To gain knowledge and validate the model, a small electrolytic pickling cell is constructed, and experiments, including bubble generation and motion observation, are conducted. The experimental work has shown the remarkable bubble production and adherence to the surfaces, and its effects on reducing pickling efficiency and uniformity. The pickling efficiency is about 30%, confirming other researchers' results. The analytical model shows trends very similar to those observed in the experiments, and provides very valuable guidance. It shows, for example, that the current efficiency decreases as the electrode-band distance increases, and it increases with the band thickness and the band-to-electrolyte conductivity ratio, The energy efficiency decreases by orders of magnitude faster than the current efficiency with all of the above-mentioned parameters, because of the correspondingly strong drop in the band-surface potential. A large amount of current is lost due to interelectrode short circuiting.

Place, publisher, year, edition, pages
2002. Vol. 38, no 3, 238-246 p.
Keyword [en]
acidity, article, electric conductivity, electrochemical analysis, electrolysis, electrolytic steel pickling process, evaluation, mathematical analysis, mathematical model, process model, surface charge, theoretical model
National Category
Fluid Mechanics and Acoustics
Identifiers
URN: urn:nbn:se:kth:diva-9005ISI: 000175065000003OAI: oai:DiVA.org:kth-9005DiVA: diva2:14534
Note

QC 20101025. Tidigare titel: A simple analytical model for predicting some features of the electrolytic steel-pickling process

Available from: 2006-01-16 Created: 2006-01-16 Last updated: 2017-04-28Bibliographically approved
In thesis
1. Mathematical modelling and experimental studies of the electrolytic pickling of stainless steel
Open this publication in new window or tab >>Mathematical modelling and experimental studies of the electrolytic pickling of stainless steel
2005 (English)Doctoral thesis, comprehensive summary (Other scientific)
Place, publisher, year, edition, pages
Stockholm: KTH, 2005. vi, 54 p.
Series
Trita-MEK, ISSN 0348-467X ; 2005:20
Keyword
electrolytic pickling, mass transfer, current distribution, electrolysis, two-phase flow
National Category
Fluid Mechanics and Acoustics
Identifiers
urn:nbn:se:kth:diva-591 (URN)
Public defence
2006-01-27, Sal F3, Lindstedtsvägen 26, Stockholm, 13:15
Opponent
Supervisors
Note
QC 20101027Available from: 2006-01-16 Created: 2006-01-16 Last updated: 2010-10-27Bibliographically approved

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