Effect of Temperature and Nickel Formate Content on the Preparation of Zn-Ni Cementation Layer
XU Penghui1, WANG Shengmin1,*, LE Linjiang2, XIAO Min1, ZHAO Xiaojun1
1 Faculty of Materials Science and Engineering, Kunming University of Science and Technology, Kunming 650093, China 2 Yan Cheng Keao Machinery Co., Ltd., Yancheng 224008, Jiangsu, China
Abstract: In order to improve the anti-corrosion performance of sherardizing layer, zinc-nickel alloy cementation layer was prepared by adding nickel formate in the sherardizing process. The effects of temperature (400 ℃,450 ℃,500 ℃,550 ℃,600 ℃)and nickel formate content(0 g,15 g,44 g,75 g,103 g) on the formation process of the infiltration layer are analyzed. Scanning electron microscope (SEM, equipped with EDS spectrum) and X-ray diffractometer (XRD) were used to analyze the cross-sectional morphology and phase composition of different samples; lectrochemical polarization curve and impedance spectroscopy (EIS) were used to characterize the different the electrochemical behavior of the sample in 3.5wt% NaCl solution, and the corrosion resistance of the cementation layer was tested by a neutral salt spray experiment; the hardness of different phase layers from the surface of the cementation layer to the substrate was tested by a micro Vickers hardness tester. The results show that: with the increase of temperature, the cementation layer is thickens obviously and the surface hardness of the cemented layer decreases; with the increase of nickel formate content, the cementation layer is thins obvlously, and the diffraction peaks of ZnO and Fe3ZnC0.5 phase are significantly enhanced, and the intermediate phase of the cementation layer's hardness value increases; temperature and nickel formate content have no obvious effect on the self-corrosion potential. The corrosion current density increases with the increase of temperature, and obviously decreases with the increase of nickel formate content; the sample impedance arc radius and the resistance of the cementation layer increases with the increase of nickel formate content; the higher the nickel formate content, the less white rust appears in the salt spray test, and the time for red rust appears to be significantly longer. In summary, the addition of nickel formate significantly improves the structure of the sherardized layer, and significantly improves the corrosion resistance of the cementation layer. It is of positive significance to promote the application of zinc-nickel alloy co-cementation technology.
徐鹏辉, 王胜民, 乐林江, 肖敏, 赵晓军. 温度和甲酸镍含量对制备Zn-Ni合金渗层的影响[J]. 材料导报, 2023, 37(16): 21120065-8.
XU Penghui, WANG Shengmin, LE Linjiang, XIAO Min, ZHAO Xiaojun. Effect of Temperature and Nickel Formate Content on the Preparation of Zn-Ni Cementation Layer. Materials Reports, 2023, 37(16): 21120065-8.
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2023, Vol. 37 
