Microscopic investigation on pitting corrosion of Ni-Cr-Mo-V high-strength steel weldment in simulated deep-sea environment

The pitting corrosion behavior and mechanism of Ni-Cr-Mo-V high-strength low-alloy steel weldment in simulated deep-sea environment were investigated by in-situ electrochemical measurements and microscopic observation techniques. The results show that pitting corrosion is the main degradation form o...

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Bibliographic Details
Published in:Materials today communications 2024-03, Vol.38, p.108397, Article 108397
Main Authors: Bai, Xuehan, Wang, Yanpei, Fan, Lin, Gu, Lianghua, Ma, Li, Xu, Likun, Li, Zhen, Sun, Mingxian, Yang, Wenshan
Format: Article
Language:English
Subjects:
Deep sea
Electrochemical characteristics
High-strength low-alloy steel
Microscopic observation
Non-metallic inclusions
Pitting corrosion
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Summary:The pitting corrosion behavior and mechanism of Ni-Cr-Mo-V high-strength low-alloy steel weldment in simulated deep-sea environment were investigated by in-situ electrochemical measurements and microscopic observation techniques. The results show that pitting corrosion is the main degradation form of Ni-Cr-Mo-V steel in the deep sea, and its weldment exhibits more severe localized attack under the macro-galvanic effect at the welded joint. HAZ is more sensitive to pitting due to the inhomogeneity of microstructure and composition. Most pitting is associated with non-metallic inclusions. The Al-enriched inclusions makes greater contribution to pitting than Si-enriched and Ti-enriched inclusions. The hydrostatic pressure in the deep sea promotes pitting, which is induced either by the preferential dissolution of the soluble components of the inclusions or by the micro-crevices and internal stresses formed at inclusion/matrix interface. [Display omitted]
ISSN:2352-4928
2352-4928
DOI:10.1016/j.mtcomm.2024.108397