Low-Temperature Plasma Nitriding of 3Cr13 Steel Accelerated by Rare-Earth Block

You, Yuan; Li, Rui; Yan, Mufu; Yan, Jihong; Chen, Hongtao; Wang, Chaohui; Liu, Dongjing; Hong, Lin; Han, Tingjie

doi:10.3390/coatings11091050

Open AccessArticle

Low-Temperature Plasma Nitriding of 3Cr13 Steel Accelerated by Rare-Earth Block

by

Yuan You

^1,2,3,*,

Rui Li

¹

,

Mufu Yan

²,

Jihong Yan

³,

Hongtao Chen

⁴,

Chaohui Wang

¹,

Dongjing Liu

¹,

Lin Hong

¹ and

Tingjie Han

¹

School of Materials Science and Engineering, Qiqihar University, Qiqihar 161006, China

²

National Key Laboratory of Metal Precision Thermal Processing, School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001, China

³

School of Mechanical and Electrical Engineering, Harbin Institute of Technology, Harbin 150001, China

⁴

School of Materials Science and Engineering, Harbin University of Science and Technology, Harbin 150040, China

^*

Author to whom correspondence should be addressed.

Coatings 2021, 11(9), 1050; https://doi.org/10.3390/coatings11091050

Submission received: 29 July 2021 / Revised: 25 August 2021 / Accepted: 28 August 2021 / Published: 31 August 2021

(This article belongs to the Special Issue Surface Engineering of C/N/O Functionalized Materials)

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Abstract

The plasma nitriding of 3Cr13 steel occurred at 450 °C for 4, 8 and 12 h in NH₃ with and without rare earth (RE). The nitrided layers were characterized using an OM, SEM, TEM, XRD, XPS, microhardness tester and electrochemical workstation. The modified layer, with and without La, are composed of a compound layer and diffusion layer from surface to core. After the addition of La during nitriding, the maximum increase of layer thickness, mass gain and average microhardness was 15.6%, 35.8% and 212.50HV_0.05, respectively. With the increase of the proportion of ε-Fe_2-₃N, the passivation zone of the corrosion resistance curve increases from 2.436 to 3.969 V, the corrosion current density decreases, the corrosion potential and pitting potential both increase, and, consequently, the corrosion resistance is significantly improved. Most of the surface microstructures of the nitrided layer was refined by the addition of La. The presence of La reduces the N content in the modified layer, which accelerates the diffusion of N atoms and, thus, accelerates the nitriding process.

Keywords: 3Cr13 steel; plasma nitriding; microstructure; microhardness; corrosion resistance

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MDPI and ACS Style

You, Y.; Li, R.; Yan, M.; Yan, J.; Chen, H.; Wang, C.; Liu, D.; Hong, L.; Han, T. Low-Temperature Plasma Nitriding of 3Cr13 Steel Accelerated by Rare-Earth Block. Coatings 2021, 11, 1050. https://doi.org/10.3390/coatings11091050

AMA Style

You Y, Li R, Yan M, Yan J, Chen H, Wang C, Liu D, Hong L, Han T. Low-Temperature Plasma Nitriding of 3Cr13 Steel Accelerated by Rare-Earth Block. Coatings. 2021; 11(9):1050. https://doi.org/10.3390/coatings11091050

Chicago/Turabian Style

You, Yuan, Rui Li, Mufu Yan, Jihong Yan, Hongtao Chen, Chaohui Wang, Dongjing Liu, Lin Hong, and Tingjie Han. 2021. "Low-Temperature Plasma Nitriding of 3Cr13 Steel Accelerated by Rare-Earth Block" Coatings 11, no. 9: 1050. https://doi.org/10.3390/coatings11091050

APA Style

You, Y., Li, R., Yan, M., Yan, J., Chen, H., Wang, C., Liu, D., Hong, L., & Han, T. (2021). Low-Temperature Plasma Nitriding of 3Cr13 Steel Accelerated by Rare-Earth Block. Coatings, 11(9), 1050. https://doi.org/10.3390/coatings11091050

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Low-Temperature Plasma Nitriding of 3Cr13 Steel Accelerated by Rare-Earth Block

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