Temperature-driven mechanisms of hydrogen embrittlement and electrochemical corrosion in Ni-based superalloy 600
Year: 2025
Type: article
Abstract: The temperature-dependent mechanisms for hydrogen-induced embrittlement and electrochemical corrosion in Ni-based superalloy 600 have been unravelled by means of tensile tests and potentiodynamic polarization tests under electrochemical environment. Increasing temperature accelerates electrochemical corrosion behaviour and induces the transition into intergranular corrosion, whereas there exists critical temperature T HE, max , in which hydrogen-induced ductility loss reaches its peak. Detailed electron microscopy and thermal desorption spectroscopy analysis demystify that intergranular brittle fracture at T HE, max is predominantly driven by hydrogen-dislocation-grain boundary interactions, compounded by high diffusible hydrogen content. These findings offer new insights into the critical role of temperature in modulating hydrogen embrittlement and corrosion, contributing to the design of materials in hydrogen environment.
Authors: Jiaqing Li, Xi Yu, Zhiye Zheng, Kai Lu, Lin Teng, Yu Ding, Zhuwu Zhang, Hui Wang, Che Zhang, Lilong Jiang
Language: English
Subfield: Metals and Alloys
Field: Materials Science
Domain: Physical Sciences
Open Access status: gold
Estimated APC paid: $1,640
Awards: G1992870934, G2966902002
OpenAlex ID: W4408185017