Work

Nanoscale study on the roles of sensitization in corrosion of 316H SS in liquid lead bismuth environments

Year: 2025

Type: article

Abstract: Austenitic stainless steel (SS) is one of the most promising structural materials for once through steam generator (OTSG) of lead-cooled fast reactors (LFR). In this article, 316H SS samples with different degrees of sensitization were subjected to corrosion experiments in a liquid lead-bismuth environment at 550°C for 1000 h. Intergranular and intragranular oxidation were observed in all samples, but the degree of sensitization had a weak correlation with the oxide thickness of 316H SS in the LBE environment. The presence of a micron-scale/nm-scale Ni-Fe phase at grain boundaries and in grains was verified by transmission electron microscopy and atom probe tomography, which inhibited the inward diffusion of oxygen and outward diffusion of Fe in 316H SS and impeded oxidation front.

Source: Corrosion Communications

DOI: 10.1016/j.corcom.2025.09.001

Authors: Jiaxin Chen, Jiajun Liu, Yifei Wang, Yuntong Pu, Jian Xu

Institutions: Sun Yat-sen University, Tohoku University

Language: English

Topic: Nuclear Materials and Properties

Subfield: Materials Chemistry

Field: Materials Science

Domain: Physical Sciences

Open Access status: gold

Estimated APC paid: $1,800

Funders: National Natural Science Foundation of China, National Key Research and Development Program of China, Shenzhen Science and Technology Innovation Program