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首页> 外文期刊>Journal of Materials Engineering and Performance >Electrochemical Deposition of Ni on an Al-Cu Alloy
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Electrochemical Deposition of Ni on an Al-Cu Alloy

机译：Ni在Al-Cu合金上的电化学沉积

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摘要

Metallic coatings can be used to improve the wear and corrosion resistance of Al alloys. In this study, Ni was used as a candidate material for such a coating which was applied on the surface of Al 2014 alloy using electrodeposition in a standard Watt's bath. A two-step heat treatment procedure was employed that served to increase the adhesion as well as hardness of Ni. Deposition was undertaken for different durations using both galvanostatic and potentiostatic techniques. The effect of deposition parameters such as surface finish, current, potential, temperature, pH level and duration on the microstructure, adhesion, and surface properties of the Ni deposit was studied. Materials characterization was performed using scanning electron microscopy, atomic force microscopy, and x-ray diffraction. Cross-sectional scanning transmission electron microscope images revealed the fine-grained (10 nm) structure of Ni initially deposited at the Ni-Al alloy substrate. Microhardness, adhesion, and corrosion behavior of the Ni deposit were evaluated. Experimental results indicate that deposition by galvanostatic technique on 1 μm surface finish at 45℃ with a pH level maintained at 3.6 represented the optimum conditions to generate a uniform Ni deposit on Al 2014. It was concluded that Ni deposition can be used to improve the surface properties of Al alloys.
机译：金属涂层可用于改善铝合金的耐磨性和耐腐蚀性。在这项研究中，Ni被用作这种涂层的候选材料，该涂层通过在标准瓦特浴中进行电沉积而应用于Al 2014合金的表面。采用两步热处理程序，以增加镍的附着力和硬度。使用恒电流和恒电位技术在不同的时间进行沉积。研究了诸如表面光洁度，电流，电势，温度，pH值和持续时间等沉积参数对镍沉积物的微观结构，附着力和表面性质的影响。使用扫描电子显微镜，原子力显微镜和X射线衍射对材料进行表征。截面扫描透射电子显微镜图像显示了最初沉积在Ni-Al合金基底上的Ni的细颗粒（10 nm）结构。评估了镍沉积物的显微硬度，附着力和腐蚀行为。实验结果表明，通过恒电流技术在45℃，pH值保持在3.6的1μm表面光洁度下沉积是在Al 2014上产生均匀Ni沉积的最佳条件。结论是可以利用Ni沉积来改善表面铝合金的性能。

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