EFFECT OF DISCHARGE TIME ON PLASMA ELECTROLYTIC BOROCARBONITRIDING OF PURE IRON

Xiaoyue Jin, Jie Wu, Bin Wang, Xuan Yang, Lin Chen, Yao Qu and Wenbin Xue
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Xiaoyue Jin: Key Laboratory of Beam Technology and Materials, Modification of Ministry of Education, College of Nuclear Science and Technology, Beijing Normal University, Beijing 100875, China†Beijing Radiation Center, Beijing 100875, China
Jie Wu: Key Laboratory of Beam Technology and Materials, Modification of Ministry of Education, College of Nuclear Science and Technology, Beijing Normal University, Beijing 100875, China†Beijing Radiation Center, Beijing 100875, China
Bin Wang: #x2021;College of Arts and Science, Shanxi Agricultural University, Taigu 030801, Shanxi, China
Xuan Yang: Key Laboratory of Beam Technology and Materials, Modification of Ministry of Education, College of Nuclear Science and Technology, Beijing Normal University, Beijing 100875, China†Beijing Radiation Center, Beijing 100875, China
Lin Chen: Key Laboratory of Beam Technology and Materials, Modification of Ministry of Education, College of Nuclear Science and Technology, Beijing Normal University, Beijing 100875, China†Beijing Radiation Center, Beijing 100875, China
Yao Qu: Key Laboratory of Beam Technology and Materials, Modification of Ministry of Education, College of Nuclear Science and Technology, Beijing Normal University, Beijing 100875, China†Beijing Radiation Center, Beijing 100875, China
Wenbin Xue: Key Laboratory of Beam Technology and Materials, Modification of Ministry of Education, College of Nuclear Science and Technology, Beijing Normal University, Beijing 100875, China†Beijing Radiation Center, Beijing 100875, China

Surface Review and Letters (SRL), 2017, vol. 24, issue 02, 1-10

Abstract: The plasma electrolytic borocarbonitriding (PEB/C/N) process on pure iron was carried out in 25% borax solution with glycerine and carbamide additives under different discharge time at 360V. The morphology and structure of PEB/C/N hardened layers were analyzed by SEM and XRD. The hardness profiles of hardened layers were measured by microhardness test. Corrosion behavior of PEB/C/N layers was evaluated by potentiodynamic polarization and electrochemical impedance spectroscopy (EIS). Their wear performance was carried out using a pin-disc friction and wear tester under dry sliding test. The PEB/C/N samples mainly consisted of α-Fe, Fe2B, Fe3C, FeN, FeB, Fe2O3 and Fe4N phases, and the Fe2B phase was the dominant phase in the boride layer. It was found that the thickness of boride layer increased with the discharge time and reached 14μm after 60min treatment. The microhardness of the boride layer was up to 2100HV, which was much higher than that of the bare pure iron (about 150HV). After PEB/C/N treatment, the corrosion resistance of pure iron was slightly improved. The friction coefficient of PEB/C/N treated pure iron decreased to 0.129 from 0.556 of pure iron substrate. The wear rate of the PEB/C/N layer after 60min under dry sliding against ZrO2 ball was only 1/10 of that of the bare pure iron. The PEB/C/N treatment is an effective way to improve the wear behavior of pure iron.

Keywords: Plasma electrolytic borocarbonitriding; pure iron; hardened layer; wear resistance; corrosion resistance (search for similar items in EconPapers)
Date: 2017
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DOI: 10.1142/S0218625X17500160

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