University of Oulu

Tuovinen, T, Vielma, T, Lassi, U. Laboratory‐scale simulation of industrial neutral electrolytic pickling as a bipolar system—Parameters affecting indirect polarization pickling of annealed stainless steel. Engineering Reports. 2020;e12245.

Laboratory‐scale simulation of industrial neutral electrolytic pickling as a bipolar system : parameters affecting indirect polarization pickling of annealed stainless steel

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Author: Tuovinen, Teemu1; Vielma, Tuomas1; Lassi, Ulla1
Organizations: 1University of Oulu, Oulu, Finland
Format: article
Version: published version
Access: open
Online Access: PDF Full Text (PDF, 0.8 MB)
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Language: English
Published: John Wiley & Sons, 2020
Publish Date: 2020-08-17


As the production of stainless steel increases, environmental concerns due to an increasing demand of production capacity, require an efficient use of energy and materials. Efficient removal of otherwise slow‐to‐dissolve chromium oxide layer can be achieved with electrochemical pre‐pickling before final mixed acid pickling. Neutral electrolytic pickling can be used to rapidly dissolve chromium oxides but suffers from low current efficiency of both the reaction and the system. In order to study the effect of critical parameters for the current efficiency of the system, a pickling device was assembled. A system current efficiency factorial analysis of bipolar neutral electrolytic pickling was conducted for temperature, electrolyte concentration, cell potential, and electrode‐to‐sample distance. Lowering the concentration of electrolytes shows potential to increase current efficiency significantly as conductivity can be used to reduce electrode‐to‐electrode short‐circuiting, which is the biggest cause of decreased efficiency in neutral electrolytic pickling. Increasing the temperature has a positive effect on efficiency, despite increased conductivity, possibly from increasing reaction kinetics.

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Series: Engineering reports
ISSN: 2577-8196
ISSN-E: 2577-8196
ISSN-L: 2577-8196
Volume: In press
DOI: 10.1002/eng2.12245
Type of Publication: A1 Journal article – refereed
Field of Science: 116 Chemical sciences
222 Other engineering and technologies
Funding: This research was funded as part of the Business Finland Symbiosis of Metals Production and Nature project (SYMMET).
Copyright information: © 2020 The Authors. Engineering Reports published by John Wiley & Sons, Ltd. This is an open access article under the terms of the Creative Commons Attribution‐NonCommercial License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited and is not used for commercial purposes.