Effect of Simulated Annealing Conditions on Scale Formation and Neutral Electrolytic Pickling

Susanna Airaksinen; Teemu Tuovinen; Aleksi Laukka; Tero Vuolio; Eetu‐Pekka Heikkinen; Elina Riekki; Timo Manninen; Timo Fabritius

doi:10.1002/srin.202000449

journal article Nov 27, 2020

Effect of Simulated Annealing Conditions on Scale Formation and Neutral Electrolytic Pickling

Susanna Airaksinen

Teemu Tuovinen Aleksi Laukka Tero Vuolio Eetu‐Pekka Heikkinen Elina Riekki Timo Manninen Timo Fabritius

steel research international Vol. 92 No. 3 · Wiley

View at Publisher Save 10.1002/srin.202000449

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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Details

Published: Nov 27, 2020
Vol/Issue: 92(3)
License: View

Authors

S

Susanna Airaksinen

Process Metallurgy Research Unit University of Oulu P.O. Box 4300 90014 Oulu Finland

T

Teemu Tuovinen

Research Unit of Sustainable Chemistry University of Oulu Oulu Finland

A

Aleksi Laukka

Process Metallurgy Research Unit University of Oulu P.O. Box 4300 90014 Oulu Finland

T

Tero Vuolio

Process Metallurgy Research Unit University of Oulu P.O. Box 4300 90014 Oulu Finland

E

Eetu‐Pekka Heikkinen

Process Metallurgy Research Unit University of Oulu P.O. Box 4300 90014 Oulu Finland

E

Elina Riekki

Tornio R&D Center Outokumpu 95490 Tornio Finland

T

Timo Manninen

Tornio R&D Center Outokumpu 95490 Tornio Finland

T

Timo Fabritius

Process Metallurgy Research Unit University of Oulu P.O. Box 4300 90014 Oulu Finland

Cite This Article

Susanna Airaksinen, Teemu Tuovinen, Aleksi Laukka, et al. (2020). Effect of Simulated Annealing Conditions on Scale Formation and Neutral Electrolytic Pickling. steel research international, 92(3). https://doi.org/10.1002/srin.202000449

Effect of Simulated Annealing Conditions on Scale Formation and Neutral Electrolytic Pickling

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