Fundamental investigation of stress corrosion cracking of E690 steel in 
simulated marine thin electrolyte layer

Liu, Zhiyong; Hao, Wenkui; Wu, Wei; Luo, Hong; Li, Xiaogang

doi:10.1016/j.corsci.2018.12.029

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Fundamental investigation of stress corrosion cracking of E690 steel in simulated marine thin electrolyte layer

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Luo, Hong
High-Entropy Alloys, Microstructure Physics and Alloy Design, Max-Planck-Institut für Eisenforschung GmbH, Max Planck Society;

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Citation

Liu, Z., Hao, W., Wu, W., Luo, H., & Li, X. (2019). Fundamental investigation of stress corrosion cracking of E690 steel in simulated marine thin electrolyte layer. Corrosion Science, 148, 388-396. doi:10.1016/j.corsci.2018.12.029.

Cite as: https://hdl.handle.net/21.11116/0000-0008-2C08-F

Abstract

The mechanism of stress corrosion cracking (SCC) of E690 high-strength steel in a marine thin electrolyte layer (TEL) was investigated by performing in-situ mechanical–electrochemical tests, slow strain rate tensile (SSRT) tests, and characterization of corrosion morphology. It was concluded that E690 steel was highly sensitive to SCC, which was jointly determined by local anodic dissolution (AD) and hydrogen embrittlement (HE) both caused by dissolved O 2 . In addition to these functions, hydrogen oxidation catalyzed by ferric ion was found. There was a critical oxygen concentration, approximately 21 by volume, between these two different roles. Below this value, the increase in the oxygen concentration promoted the synergistic effect of AD and HE, resulting in the increase in SCC susceptibility. However, above this value, worse general corrosion offset crack initiation as well as the oxidation of hydrogen catalyzed by ferric ions reduced the SCC susceptibility. © 2018 Elsevier Ltd