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Corrosion Mechanism of Plasma-Sprayed Fe-Based Amorphous Coatings with High Corrosion Resistance

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Abstract

Fe45Cr16Mo16C18B5 amorphous coatings were deposited on the mild steel substrate (0.45 wt.% C) by plasma spraying, and their corrosion resistance in 3.5 wt.% NaCl solution was compared with those of the substrate and 316 stainless steel. Potentiodynamic tests revealed that the as-prepared coatings had higher resistance to local corrosion than 316 stainless steel due to their wide passivation range. Electrochemical impedance spectroscopy (EIS) measurements further explained the long-term corrosion process of the coatings and indicated their excellent corrosion resistance. Based on this analysis, a schematic diagram of the corrosion mechanism of the coatings was proposed. The obtained results imply that Fe45Cr16Mo16C18B5 amorphous coatings have a promising prospect for industrial applications.

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Acknowledgments

The present work was supported by the National Nature Science Foundation of China (Grant Nos. 51775329 and 51872072), the Nature Science Foundation of Tian** City, China (Grant No. 16JCQNJC03600), and the special funding for the development of science and technology of Shanghai Ocean University (Grant Nos. A2-0203-00-100231 and A2-2006-00-200371).

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Authors and Affiliations

  1. Department of Mechanical Engineering, College of Engineering, Shanghai Ocean University, Shanghai, 201306, China

    Zhenhua Chu, Wenxing Deng, **ngwei Zheng, Yuyun Zhou, **gxiang Xu & Li Gao

  2. School of Materials Science and Engineering, Hebei University of Technology, Tian**, 300132, China

    Zhenhua Chu & Chunyue Zhang

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  1. Zhenhua Chu
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  2. Wenxing Deng
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Correspondence to Zhenhua Chu or **ngwei Zheng.

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Chu, Z., Deng, W., Zheng, X. et al. Corrosion Mechanism of Plasma-Sprayed Fe-Based Amorphous Coatings with High Corrosion Resistance. J Therm Spray Tech 29, 1111–1118 (2020). https://doi.org/10.1007/s11666-020-01030-9

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