Effect of cathodic polarization on stress corrosion cracking susceptibility of 35CrMo steel for Class 12.9 fasteners in seawater

Rongrong Zhao; Likun Xu; Yonglei Xin; Jian Hou; Lin Fan; Yang Shao; Junji Xuan; Shuangfeng Bai; Lili Xue; Li Li; Weimin Guo; Zhaoqi Zhang; Bingzhi Li

Journal of Materials Research and Technology (May 2023)

Effect of cathodic polarization on stress corrosion cracking susceptibility of 35CrMo steel for Class 12.9 fasteners in seawater

Rongrong Zhao,
Likun Xu,
Yonglei Xin,
Jian Hou,
Lin Fan,
Yang Shao,
Junji Xuan,
Shuangfeng Bai,
Lili Xue,
Li Li,
Weimin Guo,
Zhaoqi Zhang,
Bingzhi Li

Affiliations

Rongrong Zhao: College of Materials Science and Chemical Engineering, Harbin Engineering University, Harbin, 150001, PR China; State Key Laboratory for Marine Corrosion and Protection, Luoyang Ship Material Research Institute, Qingdao, 266237, PR China
Likun Xu: College of Materials Science and Chemical Engineering, Harbin Engineering University, Harbin, 150001, PR China; State Key Laboratory for Marine Corrosion and Protection, Luoyang Ship Material Research Institute, Qingdao, 266237, PR China; Corresponding author.
Yonglei Xin: State Key Laboratory for Marine Corrosion and Protection, Luoyang Ship Material Research Institute, Qingdao, 266237, PR China
Jian Hou: State Key Laboratory for Marine Corrosion and Protection, Luoyang Ship Material Research Institute, Qingdao, 266237, PR China
Lin Fan: State Key Laboratory for Marine Corrosion and Protection, Luoyang Ship Material Research Institute, Qingdao, 266237, PR China
Yang Shao: State Key Laboratory for Marine Corrosion and Protection, Luoyang Ship Material Research Institute, Qingdao, 266237, PR China
Junji Xuan: State Key Laboratory for Marine Corrosion and Protection, Luoyang Ship Material Research Institute, Qingdao, 266237, PR China
Shuangfeng Bai: State Key Laboratory for Marine Corrosion and Protection, Luoyang Ship Material Research Institute, Qingdao, 266237, PR China
Lili Xue: College of Materials Science and Chemical Engineering, Harbin Engineering University, Harbin, 150001, PR China
Li Li: College of Materials Science and Chemical Engineering, Harbin Engineering University, Harbin, 150001, PR China
Weimin Guo: State Key Laboratory for Marine Corrosion and Protection, Luoyang Ship Material Research Institute, Qingdao, 266237, PR China
Zhaoqi Zhang: State Key Laboratory for Marine Corrosion and Protection, Luoyang Ship Material Research Institute, Qingdao, 266237, PR China
Bingzhi Li: State Key Laboratory for Marine Corrosion and Protection, Luoyang Ship Material Research Institute, Qingdao, 266237, PR China

Journal volume & issue: Vol. 24
pp. 9339 – 9355

Abstract

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The effect of cathodic polarization on stress corrosion cracking (SCC) of 35CrMo steel for high strength fasteners in seawater was investigated by electrochemical measurement, slow strain rate tensile tests and fracture analyses. The results demonstrated that the 35CrMo steel with a typical tempered martensite microstructure has some SCC susceptibility at the open circuit potential (OCP), and the susceptibility decreases as the potential is shifted negatively until −850 mV vs. SCE, at which the steel presents the lowest SCC susceptibility due to the inhibition of anodic dissolution (AD) and little hydrogen evolution. The SCC sensitivity increases significantly as the applied potential further shifts negatively because of intensive hydrogen evolution. The fractures are transgranular at all potentials. AD is considered to be the main cracking mechanism at OCP, while hydrogen embrittlement becomes dominant at the potential below −850 mV vs. SCE.

Published in Journal of Materials Research and Technology

ISSN: 2238-7854 (Print); 2214-0697 (Online)
Publisher: Elsevier
Country of publisher: Netherlands
LCC subjects: Technology: Mining engineering. Metallurgy
Website: https://www.journals.elsevier.com/journal-of-materials-research-and-technology/

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