TY - JOUR
T1 - Surface evolution and corrosion behaviour of Cu-doped carbide-reinforced martensitic steels in a sulfuric acid solution
AU - Yamanaka, Kenta
AU - Mori, Manami
AU - Yoshida, Kazuo
AU - Onuki, Yusuke
AU - Sato, Shigeo
AU - Chiba, Akihiko
N1 - Funding Information:
The authors acknowledge Masahiro Yamazaki (Eiwa Co., Ltd) for providing the steel specimens and Issei Narita, Kazuyo Omura, Yumiko Kodama, and Yuichiro Hayasaka (Institute for Materials Research, Tohoku University) for providing technical assistance with the microstructural/surface characterisations. This work was supported by the Grant-in-Aid for Scientific Research (B) from the Japan Society for the Promotion of Science (JSPS) [Grant No. 20H02472]; Research Promotion Grant from the Iron and Steel Institute of Japan (ISIJ); Research Grant from the Die and Mould Technology Promotion Foundation; and Research Society for Quantum-beam Analysis of Microstructures and Properties of Steels (ISIJ). EPMA and XPS were conducted at the Cooperative Research and Development Centre for Advanced Materials, Institute for Materials Research, Tohoku University [Proposal Nos. 19G0414 and 20G0416]. The neutron experiment at the MLF of J-PARC was performed as per proposal 2019PM2006.
Publisher Copyright:
© 2021, The Author(s).
PY - 2021/12
Y1 - 2021/12
N2 - Cu-doped martensitic steels (Fe–(13, 16)Cr–3W–2Cu–1C) (mass%) with multiple carbide precipitates were prepared at different quenching temperatures, and their corrosion behaviours were examined by measuring the weight loss during immersion in a 0.5 M H2SO4 solution. Lower weight losses and corrosion rates were obtained for the alloy samples prepared at higher quenching temperatures. Surface Cu enrichment was observed for all specimens with a large fraction of dissolved Cr species. Moreover, quenching from higher temperatures not only reduced the amount of M23C6 carbide but also decreased the local electrochemical potential difference between the carbide phase and the martensitic matrix via enhanced surface Cu accumulation, thus increasing corrosion resistance by suppressing microgalvanic corrosion between the constituent phases. The corrosion behaviour of the studied steels was remarkably different from those of the Cu-doped stainless and low-alloy steels with passive oxide surface films, suggesting the strong effect of multiple carbide precipitates on their corrosion behaviour.
AB - Cu-doped martensitic steels (Fe–(13, 16)Cr–3W–2Cu–1C) (mass%) with multiple carbide precipitates were prepared at different quenching temperatures, and their corrosion behaviours were examined by measuring the weight loss during immersion in a 0.5 M H2SO4 solution. Lower weight losses and corrosion rates were obtained for the alloy samples prepared at higher quenching temperatures. Surface Cu enrichment was observed for all specimens with a large fraction of dissolved Cr species. Moreover, quenching from higher temperatures not only reduced the amount of M23C6 carbide but also decreased the local electrochemical potential difference between the carbide phase and the martensitic matrix via enhanced surface Cu accumulation, thus increasing corrosion resistance by suppressing microgalvanic corrosion between the constituent phases. The corrosion behaviour of the studied steels was remarkably different from those of the Cu-doped stainless and low-alloy steels with passive oxide surface films, suggesting the strong effect of multiple carbide precipitates on their corrosion behaviour.
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U2 - 10.1038/s41529-021-00187-0
DO - 10.1038/s41529-021-00187-0
M3 - Article
AN - SCOPUS:85112680072
SN - 2397-2106
VL - 5
JO - npj Materials Degradation
JF - npj Materials Degradation
IS - 1
M1 - 43
ER -