A mechano-chemical investigation of SCC mitigation in pre-strained Alloy 600 in a simulated boiling water reactors environment with high oxygen concentrations

Corrosion Science 2026 Open access

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Authors: Pan Liu, Yunlong Wu, Tao Wu, Jun Chai, Ken Oyama, Seiya Ogota, Yutaka Watanabe, Xiangyu Zhong, Qin-Hao Zhang, Fahe Cao, Tetsuo Shoji
DOI: 10.1016/j.corsci.2026.113736
Cited by: 2
References: 94

Abstract

This study clarifies the mechano-chemical role of surface treatments on the SCC of sensitized Alloy 600. We compared 400-grit grinding, Scotch-Brite polishing, and CWJP under “bend-then-treat” CBB testing. While grinding caused severe cracking, CWJP provided complete immunity during a 500 h CBB testing. This occurred despite the CWJP surface having the highest GND density and roughness. The dominant protective mechanism was a relatively deeper, higher-magnitude CRS field induced by CWJP. This CRS mechanically counteracts applied loads and electrochemically stabilizes the surface by retarding DO diffusion, as confirmed by DFT. Engineering deep CRS is thus paramount for mitigating SCC.

Fields of Study & Subjects

Hydrogen embrittlement and corrosion behaviors in metals Nuclear Materials and Properties Fusion materials and technologies

Publication details

Journal / source
Corrosion Science
Publisher
Elsevier BV
Volume
264
Pages
113736–113736
Publication date
28 February 2026
Language
EN