Abstract

In this study the wear properties of chromium deposit were improved by using the nickel electrodeposited middle layers. The nickel middle layers were formed by direct current (DC) and pulse current (PC) power supplies. The results showed that the surface morphology of a chromium layer in Ni/Cr coating (DC deposited) and Ni (duty cycle = 30%, frequency = 20 Hz, PC deposited) were compact, with small nodules. Also in these coatings the crack networks density of the chromium layer decreased when compared other coatings. The hardness step value profiles with the highest value of the chromium layer and the lowest value of the nickel middle layer occurred in the studied five samples. The compact surface morphology and the appropriate hardness step value profiles of the layers were two main reasons for improving the wear resistance of the chromium layer coated on the top of the nickel layers produced by DC and PC (duty cycle = 30% and frequency = 20 Hz) currents.

中文翻译：

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使用镍中间层提高铬层的磨损性能

摘要

在这项研究中，通过使用镍电沉积中间层来改善铬沉积物的磨损性能。镍中间层由直流 (DC) 和脉冲电流 (PC) 电源形成。结果表明，Ni/Cr 涂层（DC 沉积）和 Ni（占空比 = 30%，频率 = 20 Hz，PC 沉积）中铬层的表面形貌致密，有小结节。同样在这些涂层中，与其他涂层相比，铬层的裂纹网络密度降低。在所研究的五个样品中出现了铬层最高值和镍中间层最低值的硬度阶跃值分布。