脉冲电镀Ni-Cr-Mo合金镀层施镀时间的研究

发布时间：2018-05-26 11:08

本文选题：脉冲电镀 + Ni-Cr-Mo合金镀层　；参考：《热加工工艺》2017年18期

【摘要】：采用脉冲电镀法在Q235钢表面制备Ni-Cr-Mo合金镀层。利用扫描电镜(SEM)、辉光放电光谱仪(GDS)、Tafel曲线和电化学阻抗谱(EIS)考察了施镀时间对镀层表面形貌、形成过程、镀层厚度、元素含量和耐蚀性的影响。结果表明:镀层由粒状结构形核、长大并逐层叠加形成;镀层的形成存在一个孕育期,孕育期后一定时间内镀层增厚较为困难,施镀时间继续增大,镀层可顺利增厚。随施镀时间的增大,镀层镍含量增大,铬含量减小,钼含量减小。在3.5%NaCl溶液中,镀层耐蚀性先增强后减弱。施镀时间为50 min时制备的镀层具有最大的自腐蚀电位(-0.355 V)、最小的腐蚀电流密度(0.006μA·cm~(-2))和最大的电荷转移电阻(26544Ω·cm~2),耐蚀性最好。
[Abstract]:Ni-Cr-Mo alloy coating was prepared on Q235 steel by pulse electroplating. The effects of plating time on the surface morphology, formation process, coating thickness, element content and corrosion resistance were investigated by means of scanning electron microscope (SEM), glow discharge spectrometer (GDS), Tafel curve and electrochemical impedance spectroscopy (EIS). The results showed that the coating was nucleated by granular structure, grew up and formed layer by layer superposition, and there was a incubation period in the formation of the coating. It was difficult to increase the coating thickness within a certain time after inoculation, and the plating time continued to increase, and the coating could be thickened smoothly. With the increase of plating time, the nickel content, chromium content and molybdenum content of the coating increase. In 3.5%NaCl solution, the corrosion resistance of the coating was first enhanced and then weakened. When the plating time is 50 min, the coating has the highest corrosion potential (0.355V), the minimum corrosion current density (0.006 渭 A) and the maximum charge transfer resistance (26544 惟 cm ~ (-2), and the best corrosion resistance.
【作者单位】：华北理工大学现代冶金技术教育部重点实验室;
【基金】：国家自然科学基金资助项目(51474088)
【分类号】：TQ153

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