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Effect of Cobalt on the Microstructure and Corrosion Behavior of Martensitic Age-Hardened Stainless Steel

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Abstract

To evaluate the influence of cobalt on the microstructure and pitting behavior of martensitic age-hardened stainless steel (MASS), the microstructures and electrochemical behaviors were characterized by optical microscopy, scanning electron microscopy, transmission electron microscopy, x-ray photoelectron spectroscopy, potentiodynamic curve, electrochemical impedance spectroscopy, and Mott–Schottky analysis. Results indicated that adding cobalt reduced the grain size of the original austenite, refined the lath martensite, inhibited the precipitation of Cu-rich phases, and increased the content of reversed austenite. Compared with the cobalt-free steel, the cobalt-containing steel has a higher pitting potential, lower corrosion current density, and higher pitting resistance. The primary components of the passive film grown on the cobalt-free steel included (Cr, Fe) oxides, such as Cr2O3, Cr(OH)3, FeOOH, and Fe2O3. The cobalt-containing steel included the aforementioned components as well as Co, which was attributed to the formation of the passive film in the forms of CoFe2O4, Co(OH)2, and CoO. In addition, the synergy of the refined lath martensite and the precipitation of the Cu-rich phase induced an increase in corrosion resistance in MASS containing cobalt.

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Acknowledgments

The authors acknowledge the support for this provided by the National Natural Science Foundation of China (51774226), Iron and Steel Joint Fund of the National Natural Science Foundation of China (U1460104), Major Program of Science and Technology in Shanxi Province (No. 20181101016), and Key Program of Shaanxi Province (2018ZDXM-GY-149).

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Authors and Affiliations

  1. State Key Laboratory for Mechanical Behavior of Materials, Xi’an Jiaotong University, Xi’an, 710049, China

    Wei Zhang & Guanjun Qiao

  2. School of Metallurgy and Engineering, Xi’an University of Architecture and Technology, Xi’an, 710055, China

    Xin Zhang, Dening Zou, Yuqing Zhou & Chu Shen

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  1. Wei Zhang
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Zhang, W., Zhang, X., Qiao, G. et al. Effect of Cobalt on the Microstructure and Corrosion Behavior of Martensitic Age-Hardened Stainless Steel. J. of Materi Eng and Perform 28, 4197–4208 (2019). https://doi.org/10.1007/s11665-019-04185-x

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