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Mathematical modelling and experimental studies of the electrolytic pickling of stainless steel
KTH, School of Engineering Sciences (SCI), Mechanics.
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 [en]
electrolytic pickling, mass transfer, current distribution, electrolysis, two-phase flow
National Category
Fluid Mechanics and Acoustics
Identifiers
URN: urn:nbn:se:kth:diva-591OAI: oai:DiVA.org:kth-591DiVA: diva2:14539
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
List of papers
1. Electrolytic pickling of steel: a critical review
Open this publication in new window or tab >>Electrolytic pickling of steel: a critical review
(English)Article in journal (Other academic) Submitted
National Category
Fluid Mechanics and Acoustics
Identifiers
urn:nbn:se:kth:diva-9004 (URN)
Note
QS 20120327Available from: 2006-01-16 Created: 2006-01-16 Last updated: 2012-03-27Bibliographically approved
2. Simple analytical model predicting some features of the electrolytic steel-pickling process
Open this publication in new window or tab >>Simple analytical model predicting some features of the electrolytic steel-pickling process
Show others...
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.

Keyword
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:nbn:se:kth:diva-9005 (URN)000175065000003 ()
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
3. Improvement of the electrolytic metal pickling process by inter-electrode insulation
Open this publication in new window or tab >>Improvement of the electrolytic metal pickling process by inter-electrode insulation
2005 (English)In: Ironmaking & steelmaking, ISSN 0301-9233, Vol. 32, no 1, 87-96 p.Article in journal (Refereed) Published
Abstract [en]

The existing industrial electrolytic steel pickling process is only 30% current efficient. Use of approximate modelling of the process and solution of the model predicts that inter-electrode insulation improves the current and energy efficiency, and this paper describes the experimental work that has validated this prediction. Some of the main results are: (a) the current efficiency varied from 20% without insulation to 100% with complete insulation, (b) the use of just partial insulations yielded a significant improvement in the process efficiency and at the same time maintained good electrolyte mixing and homogeneity which can not be attained with complete insulation. The theoretical foundations of this method and its various consequences are discussed. The method is relatively easy to apply to existing industrial electrolytic pickling tanks, and also provides system control flexibility for optimal pickling of different steel grades. The method's application cost is relatively low and saves investment in new equipment if a retrofit of an existing system is desired.

Keyword
steels, pickling, efficiency, insulation
National Category
Fluid Mechanics and Acoustics
Identifiers
urn:nbn:se:kth:diva-9006 (URN)10.1179/174328105X23996 (DOI)000227331000013 ()2-s2.0-22944434251 (Scopus ID)
Note
QC 20101025Available from: 2006-01-16 Created: 2006-01-16 Last updated: 2010-10-27Bibliographically approved
4. Electrolytic pickling of duplex stainless steel
Open this publication in new window or tab >>Electrolytic pickling of duplex stainless steel
Show others...
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
Abstract [en]

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.

Keyword
Austenite, Decision making, Electrolysis, Peeling, Pickling, Productivity, Spalling, Anode surfaces, Bubble coverage, Duplex stainless steel, Electrolytic pickling
National Category
Fluid Mechanics and Acoustics
Identifiers
urn:nbn:se:kth:diva-9007 (URN)10.1002/maco.200403858 (DOI)000231329800001 ()
Note
QC 20101025Available from: 2006-01-16 Created: 2006-01-16 Last updated: 2010-10-25Bibliographically approved
5. Numerical and experimental study of the effect of gas evolution in electrolytic pickling
Open this publication in new window or tab >>Numerical and experimental study of the effect of gas evolution in electrolytic pickling
2006 (English)In: Journal of Applied Electrochemistry, ISSN 0021-891X, E-ISSN 1572-8838, Vol. 36, no 12, 1367-1379 p.Article in journal (Refereed) Published
Abstract [en]

As part of a progressive approach to model the electrolytic pickling process, this paper focuses on the important aspect of hydrogen and oxygen gas evolution on the electrodes and on the steel strip being pickled. The system considered consists of type 316 stainless steel pickled in aqueous sodium sulphate, with lead anodes and stainless steel cathodes. The mathematical model is two-dimensional steady-state, and includes the differential equations describing the effect of migration, giving the potential and current fields, and the Tafel kinetic rate expressions for hydrogen and oxygen gas generation. Experiments were conducted to obtain a better understanding of the process and for model validation. Good agreement between the experimental measurements of the global current efficiency and the model predictions was obtained.

Keyword
corrosion, electrolytic bubble generation, electrolytic pickling, stainless steel, 2-phase flow model, electrochemical-cell, hydrogen evolution, evolving electrodes, ohmic resistance, stainless-steels, bubbles, conductivity, convection, layer
National Category
Fluid Mechanics and Acoustics
Identifiers
urn:nbn:se:kth:diva-16215 (URN)10.1007/s10800-006-9201-4 (DOI)000242938400009 ()2-s2.0-33751071579 (Scopus ID)
Note
QC 20100525Available from: 2010-08-05 Created: 2010-08-05 Last updated: 2017-12-12Bibliographically approved
6. Single- and two-phase modelling of the electrochemical pickling of steel
Open this publication in new window or tab >>Single- and two-phase modelling of the electrochemical pickling of steel
(English)Manuscript (preprint) (Other academic)
National Category
Fluid Mechanics and Acoustics
Identifiers
urn:nbn:se:kth:diva-9009 (URN)
Note
QC 20101027Available from: 2006-01-16 Created: 2006-01-16 Last updated: 2010-10-27Bibliographically approved

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Citation style
  • apa
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  • modern-language-association-8th-edition
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Output format
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