Electrochemical noise monitoring of the atmospheric corrosion of steels: identifying corrosion form using wavelet analysis. (18th August 2017)

• Record Type: Journal Article
• Authors: Ma, Chao; Song, Shizhe; Gao, Zhiming; Wang, Jihui; Hu, Wenbin; Behnamian, Yashar; Xia, Da-Hai
• Is Part Of: Corrosion engineering, science, and technology. Volume 52:Number 6(2017)
• Page Start: 432
• Page End: 440
• Publication Date: 2017-08-18
• Subjects: Atmospheric corrosion -- electrochemical noise -- corrosion monitoring -- wavelet transform -- corrosion form; Corrosion and anti-corrosives -- Periodicals; 620.11223
• DOI: 10.1080/1478422X.2017.1320117
• Languages: English
• ISSNs: 1478-422X

Abstract

ABSTRACT: The early stage atmospheric corrosion of T91 and Q235B steels exposed to Tianjin's urban atmosphere over 20 days was studied using two electrochemical probes via an electrochemical noise (EN) technique. To identify the corrosion process and the corrosion form of the two steels, EN data were analysed by statistics and wavelet transform. The results revealed that the wavelet energy of decomposed EN mainly located at high-frequency level for Q235B steel, whereas it mainly located at the low-frequency level for T91 steel. Analyses of surface images confirmed that Q235B steel underwent uniform corrosion whereas T91 steel suffered from localised corrosion. The obtained noise resistance correlated well with weight loss data. GRAPHICAL ABSTRACT: