光谱学与光谱分析 |
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Preparation of Electrodeposited Mo-Ni Coating and Its Spectral Properties |
LIU Xiao-zhen1, XIONG Li-ping1, LIU Xiao-zhou2, CHEN Jie3, LUO Yi-fan1, SUN Ying1 |
1. School of Chemical and Environmental Engineering, Shanghai Institute of Technology, Shanghai 201418, China 2. Gannan Normal University, Ganzhou 341000, China 3. Regenia AB, Stockholm 10691, Sweden |
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Abstract Mo-Ni coatings were prepared on Ni alloy by electrodeposition method. The properties of microhardness, wear weight loss and friction coefficients, and thermal expansion of the coatings were investigated, respectively. Mo-Ni coatings were characterized with inductively coupled plasma-atomic emission spectroscopy (ICP-AES), energy-dispersive analyses of X-ray (EDAX), scanning electron microcopy (SEM), and X-ray diffraction (XRD) techniques, respectively. Mo-Ni coating shows higher microhardness, lower wear weight loss and friction coefficient compared with those of Ni alloy. The microhardness of Mo-Ni coating is as high as 518 HV, which is 72.67% higher than that of the Ni alloy (300 HV). The wear weight losses of Mo-Ni coating is 1.94 times lower than that of Ni alloy. The friction coefficient of Ni alloy and Mo-Ni coating are 0.640 and 0.559 respectively. The physical thermal expansion curve of Ni alloy has two the peaks in the ranges of 100~120 and 570~640 ℃ respectively; and that of Ni alloy+Mo-Ni coating has one the peaks in the ranges of 570~640 ℃. The peak of the physical thermal expansion curve of Ni alloy+Mo-Ni coating in the ranges of 570~640 ℃ is much smaller than that of the Ni alloy. Because the part of nickel was replaced by molybdenum in the Ni lattice, molybdenum decreases the lattices transformation of nickel (bcc→fcc). The reason for the formation of the small peak of the physical thermal expansion curve of Ni alloy+Mo-Ni coating in the ranges of 595~625 ℃ is the changes of MoNi4 and MoNi from the semi-crystalline structure to the crystalline structure respectively.
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Received: 2013-07-09
Accepted: 2013-11-18
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Corresponding Authors:
LIU Xiao-zhen
E-mail: liuxiaozhen1958@yahoo.com
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