University of Oulu

Airaksinen, S., Tuovinen, T., Laukka, A., Vuolio, T., Heikkinen, E.‐P., Riekki, E., Manninen, T. and Fabritius, T. (2021), Effect of Simulated Annealing Conditions on Scale Formation and Neutral Electrolytic Pickling. steel research int. 2000449. https://doi.org/10.1002/srin.202000449

Effect of simulated annealing conditions on scale formation and neutral electrolytic pickling

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Author: Airaksinen, Susanna1; Tuovinen, Teemu2; Laukka, Aleksi1;
Organizations: 1Process Metallurgy Research Unit, University of Oulu, P.O. Box 4300, 90014 Oulu, Finland
2Research Unit of Sustainable Chemistry, University of Oulu, Oulu, Finland
3Tornio R&D Center, Outokumpu, 95490 Tornio, Finland
Format: article
Version: accepted version
Access: embargoed
Persistent link: http://urn.fi/urn:nbn:fi-fe202101262709
Language: English
Published: John Wiley & Sons, 2021
Publish Date: 2021-11-14
Description:

Abstract

Scale formation of AISI 304 stainless steel during annealing at temperatures between 1100 and 1200 °C under a water vapor‐containing atmosphere is studied. Characterization of the oxide scale is performed with field‐emission scanning electron microscopy–energy dispersive spectroscopy (FESEM–EDS) and glow discharge optical emission spectroscopy (GDOES) and removal of oxide scale is done via neutral electrolyte pickling. The pickling conditions are kept constant and the effect of the annealing conditions and scale properties on the pickling result are examined. The effectiveness of pickling is evaluated using analysis FESEM images taken on polished sections of pickled surfaces. Research shows that the thickness, morphology, and composition of the oxide scale are dependent on annealing temperature and time. The thicknesses of the scale formed under the established conditions vary from 0.2 to over 30 μm, and morphologies between the chromium rich oxide layer and layered scale structure formed by breakaway oxidation. The pickling response of oxide scales remains good at all annealing temperatures with the shortest exposure time.

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Series: Steel research international
ISSN: 1611-3683
ISSN-E: 1869-344X
ISSN-L: 1611-3683
Volume: In press
DOI: 10.1002/srin.202000449
OADOI: https://oadoi.org/10.1002/srin.202000449
Type of Publication: A1 Journal article – refereed
Field of Science: 215 Chemical engineering
Subjects:
Funding: This research was funded as part of the Business Finland Symbiosis of Metals Production and Nature project (SYMMET).
Copyright information: © 2020 Wiley‐VCH GmbH. This is the peer reviewed version of the following article: Airaksinen, S., Tuovinen, T., Laukka, A., Vuolio, T., Heikkinen, E.‐P., Riekki, E., Manninen, T. and Fabritius, T. (2021), Effect of Simulated Annealing Conditions on Scale Formation and Neutral Electrolytic Pickling. steel research int. 2000449, which has been published in final form at https://doi.org/10.1002/srin.202000449. This article may be used for non-commercial purposes in accordance with Wiley Terms and Conditions for Self-Archiving.