ELECTROCHEMICAL CHARACTERIZATION OF AISI 304 STAINLESS STEEL SURFACE DURING INDUSTRIAL PICKLING PROCESS

1 Langová Šárka
Co-authors:
1 Raška Pavel 1 Leško Juraj 2 Klečka Antonín 1 Váňová Petra 1 Peikertová Pavlína
Institutions:
1 VSB – Technical University of Ostrava, Ostrava Czech Republic, EU, sarka.langova@vsb.cz
2 Bochemie a. s., Bohumin, Czech Republic, EU
Conference:
25th Anniversary International Conference on Metallurgy and Materials, Hotel Voronez I, Brno, Czech Republic, EU, May 25th - 27th 2016
Proceedings:
Proceedings 25th Anniversary International Conference on Metallurgy and Materials
Pages:
525-530
ISBN:
978-80-87294-67-3
ISSN:
2694-9296
Published:
14th December 2016
Proceedings of the conference were published in Web of Science and Scopus.
Metrics:
116 views / 39 downloads
Abstract

The present work deals with the possibility of the evaluation of the descaling rate of the AISI 304 stainless steel. The samples were pre-treated in the reduction melt containing NaOH, Na2O and NaH and the final pickling took place in the mixtures of acids. The cross – sections of the scales formed on the steel as received and those remained after reduction bath treatment and acid pickling were examined by using a scanning electron microscope. The surface analysis was performed by the Raman microspectroscopy and the presence of magnetite was proved for all the samples. The occurrence of this electroactive substance enabled using of the electrochemical methods (cyclic voltammetry, electrochemical impedance spectroscopy and chronocoulometry) for monitoring of the redox reactions taking place on the working electrode formed by the steel sample in 1 M NaOH solution. The application of whichever method provides a quick estimation of the pickled surface state.

Keywords: Stainless steel pickling; Raman spectroscopy; voltammetry; chronocoulometry; electrochemical impedance spectroscopy

© This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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