Degradation process of Ag/AgCl chloride-sensing electrode in cement extract with low chloride concentration

Article

Zhang, Zhangmin, Hu, Jie, Xu, Zhipeng, Huang, Haoliang, Yin, Suhong, Ma, Yuwei, Wei, Jiangxiong and Yu, Qijun. 2022. "Degradation process of Ag/AgCl chloride-sensing electrode in cement extract with low chloride concentration." Corrosion Science. 198. https://doi.org/10.1016/j.corsci.2022.110107
Article Title

Degradation process of Ag/AgCl chloride-sensing electrode in cement extract with low chloride concentration

ERA Journal ID4761
Article CategoryArticle
AuthorsZhang, Zhangmin, Hu, Jie, Xu, Zhipeng, Huang, Haoliang, Yin, Suhong, Ma, Yuwei, Wei, Jiangxiong and Yu, Qijun
Journal TitleCorrosion Science
Journal Citation198
Article Number110107
Number of Pages13
Year2022
PublisherElsevier
Place of PublicationUnited Kingdom
ISSN0010-938X
1879-0496
Digital Object Identifier (DOI)https://doi.org/10.1016/j.corsci.2022.110107
Web Address (URL)https://www.sciencedirect.com/science/article/abs/pii/S0010938X22000257
Abstract

The accelerated degradation process of Ag/AgCl chloride-sensing electrode was investigated in cement extract by electrochemical behaviors monitoring and surface analysis. The results showed that the potential of Ag/AgCl chloride-sensing electrode was negatively shifted in cement extract, accompanied by the continuous dissolution and exfoliation of AgCl film; however, no Ag2O formed on the electrode surface. The adhesive strength of AgCl to Ag substrate maintained the equilibrium potential of Ag/AgCl chloride-sensing electrode during early stage, but the negative potential shift was pronounced during late stage, which was related to the adsorption of OH- at Ag/AgCl interface, suppressing cathodic reaction on the electrode.

KeywordsA. Concrete; B. EIS; B. SEM; C. Electrodeposited films; C. Exfoliation corrosion; C. Passivity
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Byline AffiliationsSouth China University of Technology, China
Guangzhou University, China
Centre for Future Materials
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