Fabrication and Performances of Surface Modified Layers Obtained by Plasma Electrolytic Boronizing on Pure Magnesium

被引：0
|
作者：
Sun L. [1 ]
Ma Y. [1 ]
Li Q. [1 ]
Wang S. [1 ]
Wang Z. [1 ]
机构：
[1] State Key Laboratory of Advanced Processing and Recycling of Nonferrous Metals, Lanzhou University of Technology, Lanzhou
来源：
Zhongguo Biaomian Gongcheng/China Surface Engineering | 2022年 / 35卷 / 06期
关键词：
corrosion resistance; magnesium; micro-hardness; plasma electrolytic boronizing; surface modification; wear resistance;
D O I：
10.11933/j.issn.1007-9289.20210422002
中图分类号：
学科分类号：
摘要：
Pure magnesium is treated by plasma electrolytic boronizing (PEB) in borax aqueous solution to prepare a novel surface modified layer to improve its micro-hardness, wear resistance and corrosion resistance. The microstructure, element distribution and phase composition of the PEB surface modified layer are investigated by scanning electron microscope (SEM), energy dispersive spectrometer (EDS) and X-ray diffraction (XRD), respectively. Vickers micro-hardness tester, friction and wear tester are employed to characterize the micro-hardness, wear resistance of the PEB surface modified layer, respectively. Meanwhile, the corrosion resistance of the PEB surface modified layer is evaluated by potentiodynamic polarization curve and electrochemical impedance spectroscopy (EIS). In addition, the mechanism of formation of PEB surface modified layer is also analyzed, and the corresponding physical model is built. The results indicate that the obtained PEB surface modified layer consists of the oxide layer and the diffusion layer. A new phase MgB2 is detected in the PEB surface modified layer. The maximum micro-hardness of the PEB surface modified layer is about 480 HV, which is almost 16 times than that of the substrate. The friction factor of the PEB surface modified layer is merely 0.11, which decreases by 70.27% in comparison with the substrate. The wear rate of the PEB surface modified layer is about 1.62×10-9 m3 / (N·m), which is one order of magnitude lower than that of the substrate. Compared with the substrate, the corrosion current density of the PEB surface modified layer decreases by one order of magnitude, meanwhile both the capacitive loop radius and the impedance modulus increase. Namely, the micro-hardness, wear resistance and corrosion resistance of pure magnesium can be all improved by PEB treatment. © 2022 Chinese Mechanical Engineering Society. All rights reserved.
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页码：88 / 97
页数：9
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