Detection of SCC on 304 stainless steel in neutral thiosulfate solutions using electrochemical noise based on chaos theory. Issue 2 (6th March 2017)

• Record Type: Journal Article
• Authors: Zhao, Ru; Xia, Da-Hai; Song, Shi-Zhe; Hu, Wenbin
• Is Part Of: Anti-corrosion methods and materials. Volume 64:Issue 2(2017)
• Page Start: 241
• Page End: 251
• Publication Date: 2017-03-06
• Subjects: Chaos -- Wavelet analysis -- Phase space reconstruction -- 304 stainless steel -- Electrochemical noise -- SCC; Corrosion and anti-corrosives -- Periodicals; 620.11223
• DOI: 10.1108/ACMM-10-2015-1581
• Languages: English
• ISSNs: 0003-5599

Abstract

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.