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Detection of SCC on 304 stainless steel in neutral thiosulfate solutions using electrochemical noise based on chaos theory

Ru Zhao (Tianjin Key Laboratory of Composite and Functional Materials, School of Materials Science and Engineering, Tianjin University, Tianjin, China)
Da-Hai Xia (Tianjin Key Laboratory of Composite and Functional Materials, School of Materials Science and Engineering, Tianjin University, Tianjin, China)
Shi-Zhe Song (Tianjin Key Laboratory of Composite and Functional Materials, School of Materials Science and Engineering, Tianjin University, Tianjin, China)
Wenbin Hu (Tianjin Key Laboratory of Composite and Functional Materials, School of Materials Science and Engineering, Tianjin University, Tianjin, China)

Anti-Corrosion Methods and Materials

ISSN: 0003-5599

Article publication date: 6 March 2017

139

Abstract

Purpose

This paper aims to investigate the stress corrosion cracking (SCC) process of sensitized 304 stainless steel during the slow strain rate test by using the electrochemical noise (EN) technique.

Design/methodology/approach

EN data are interpreted based on chaos and wavelet analyses, and correlation dimension and wavelet energy distribution are used as indicators for SCC process identification.

Findings

Experimental results reveal that the corrosion potential abruptly decreases from 180 to 100 mV at 6,300 s and the current increases from 10 to 100 nA accordingly, which is attributed to passive film breakdown and crack initiation. Chaos and wavelet analyses results reveal that, as crack initiates, the correlation dimensions increase from 1.2 to 1.9, and the corresponding distribution frequencies of maximum relative wavelet energy change from high frequency to low frequency.

Originality/value

SCC is monitored in lab, and crack initiation and propagation are identified by chaos and wavelet analyses. This work lays the foundation for SCC detection in field using EN.

Keywords

Acknowledgements

This work was supported by the Major State Basic Research Development Program (973 Program) (Granted No. 2014CB046805), the National Natural Science Foundation of China (No. 51131007, 51671144), National Natural Science Foundation of China (51471117), and the open-ended fund of the Key laboratory of Nuclear Materials and Safety Assessment (Institute of Metal Research, Chinese Academy of Sciences, China) (No. 2016NMSAKF02).

Citation

Zhao, R., Xia, D.-H., Song, S.-Z. and Hu, W. (2017), "Detection of SCC on 304 stainless steel in neutral thiosulfate solutions using electrochemical noise based on chaos theory", Anti-Corrosion Methods and Materials, Vol. 64 No. 2, pp. 241-251. https://doi.org/10.1108/ACMM-10-2015-1581

Publisher

:

Emerald Publishing Limited

Copyright © 2017, Emerald Publishing Limited

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