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Corrosion resistance investigation of Cronidur30 high-nitrogen martensitic stainless steel by quasi-in-situ SKPFM and DFT calculation

Journal Article (2026)
Author(s)

Xiaoqian Fu (University of Science and Technology Beijing)

Yucheng Ji (University of Science and Technology Beijing)

Chao Liu (University of Science and Technology Beijing)

Wentao Qin (University of Science and Technology Beijing)

Cunyu Wang (China Iron & Steel Research Institute Group)

Wenquan Cao (China Iron & Steel Research Institute Group)

Poulumi Dey (TU Delft - Mechanical Engineering)

Xuequn Cheng (University of Science and Technology Beijing)

Jianxiong Liang (China Iron & Steel Research Institute Group)

Chaofang Dong (University of Science and Technology Beijing)

Research Group
Team Poulumi Dey
DOI related publication
https://doi.org/10.1016/j.jmrt.2026.02.120 Final published version
More Info
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Publication Year
2026
Language
English
Research Group
Team Poulumi Dey
Journal title
Journal of Materials Research and Technology
Volume number
41
Pages (from-to)
5474-5488
Downloads counter
40
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Abstract

Nitrogen alloying improves the mechanical performance of martensitic stainless steel, while tempering is required to mitigate brittleness and enhance processability. However, tempering-induced microstructural changes markedly influence the semiconducting properties of the passive film, thereby affecting corrosion resistance. This work examines the passive film of high-nitrogen martensitic stainless steel (HNMSS) tempered at different temperatures. Tempering at 200 °C yields the highest pitting potential (461.28 mV), attributed to the transformation of CrN to Cr2O3, which enhances film protection. At higher temperatures, abundant Cr-rich nitride/precipitate (M2N) depletes N and Cr in the matrix. The increase of precipitate/matrix interfaces and defect density in the passivation film impairs pitting corrosion resistance. First-principles calculations and quasi-in-situ scanning Kelvin probe force microscopy reveal that M2N precipitates exhibit a higher Volta potential and the highest work function than those of the matrix, acting as cathodes to accelerate localized matrix dissolution, which reduces nitrogen incorporation into the passive film. These findings clarify the relationship of tempering, microstructure, and corrosion in the HNMSS.