Abstract: In this work, the boriding of nickel was investigated by molten salt electrolysis process and solid powder method to improve its surface hardness. The electrochemical boriding was carried out in a borax-sodium carbonate molten electrolyte with the current density of 750 A/m2 while B4C and KBF4 were used as boronizing agent in solid powder boriding process. The microstructural characterization and phase analysis of the resultant borides layer were performed using optical scanning microscopy(SEM) and X-ray diffraction methods (XRD), and energy dispersive spectrometer(EDS) was applied to determine the element present in the borides. The results show that a boronizing layer containing Ni2B and Ni3B can be formed on the surface of pure nickel by the above two methods. The thickness of the boronizing layer is about 184.35 μm when the electrolysis temperature is 950 ℃ and the duration is 4 h, using molten salt electrolysis method. The thickness of the boronizing layer is about 176.35 μm when the boronizing temperature is 950 ℃ and duration is 10 h for the solid powder boronizing process. The surface hardness values of the boronizing samples reach 1 755HK and 1 526HK for electrochemical boriding and solid powder method respctively, which are higher than that of the pure nickel. It is found that the greater the thickness of the boronizing layer is, the higher the surface hardness value will be.
王碧侠, 于翔, 李建新, 王子钰, 马红周. 熔盐电解法和固体粉末法在纯镍表面渗硼的对比研究[J]. 材料导报, 2022, 36(18): 21050282-5.
WANG Bixia, YU Xiang, LI Jianxin, WANG Ziyu, MA Hongzhou. Comparative Study of Boronizing of Pure Nickel by Molten Salt Electrolysis Process and Solid Powder Method. Materials Reports, 2022, 36(18): 21050282-5.
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2022, Vol. 36 
