ABSTRACT

In this study, Al coatings were pulse electrodeposited from a molten salt electrolyte onto copper substrates. The effects of applied peak current density, pulse current frequency and duty cycle on the morphology, microstructure, corrosion behaviour and tribological properties of the coatings were investigated by scanning electron microscopy, X-ray diffraction, potentiodynamic polarisation, electrochemical impedance spectroscopy and pin-on-disc wear test methods. The results showed that the changes in processing parameters changed the morphological and microstructural features of the resulting coatings, which in turn affected their corrosion and wear behaviours. Coatings with smoother surfaces, finer crystallite size and more compact morphologies that were electrodeposited at higher applied peak current density (up to 80 mA cm⁻²), higher pulse current frequency (up to 50 Hz) and higher duty cycle (up to 50%) exhibited more corrosion and wear resistance than the others.

摘要

在这项研究中，铝涂层是从熔盐电解质脉冲电沉积到铜基材上的。通过扫描电子显微镜、X射线衍射、动电位极化、电化学阻抗谱和pin-on研究了施加的峰值电流密度、脉冲电流频率和占空比对涂层的形貌、微观结构、腐蚀行为和摩擦学性能的影响。 - 盘磨损测试方法。结果表明，加工参数的变化改变了所得涂层的形态和微观结构特征，进而影响了它们的腐蚀和磨损行为。在更高的应用峰值电流密度（高达 80 mA cm^-2 )、更高的脉冲电流频率（高达 50 Hz）和更高的占空比（高达 50%）表现出比其他更高的耐腐蚀性和耐磨性。