Department of Chemical Engineering and Biotechnology, National Taipei University of Technology, Taipei 10608, Taiwan; Department of Mechanical Engineering, National Taipei University of Technology, Taipei 10608, Taiwan.
Department of Mechanical Engineering, National Taipei University of Technology, Taipei 10608, Taiwan; Department of Industrial Chemistry, Alagappa University, Karaikudi 630001, Tamil Nadu, India.
Ultrason Sonochem. 2021 Apr;72:105463. doi: 10.1016/j.ultsonch.2021.105463. Epub 2021 Jan 14.
The ultrasonic-assisted electrodeposition process significantly improves the mechanical and electrochemical properties. Meanwhile, supercritical fluid technology also enhances the electrodeposition process with increased benefits, such as low surface tension, permeability, high diffusivity, and density, which improves the surface quality through grain refinement. In this study, Zn-Co films were prepared using the ultrasonic-assisted supercritical-CO (US-SC-CO) electrodeposition approach, and its pressure effect on the film was evaluated. The films were also prepared by the conventional and typical supercritical-CO (SC-CO) methods for a comparison study. All the prepared films were characterized by morphological studies, elemental composition, crystal structure orientation, and microhardness tests. Later, the fabricated films were examined by potentiodynamic polarization technique and electrochemical impedance technique (EIS) with 3.5 wt.% NaCl solution for corrosion evaluation. Based on results, Zn-Co film prepared through the US-SC-CO process shows a spherical nodule like structure with reduced grain size and significantly enhanced hardness property. In XRD studies, the shift in diffracted peak's position reveals the increased proportion of Co ions. Further, EDX results also confirm the same with the characteristic peaks. Finally, compared to the other methods, the corrosion resistance was more efficient in the US-SC-CO process by 73.75%.
超声辅助电沉积工艺显著提高了机械和电化学性能。同时，超临界流体技术也增强了电沉积过程，带来了更多益处，如低表面张力、可渗透性、高扩散性和高密度，通过细化晶粒来提高表面质量。本研究采用超声辅助超临界-CO（US-SC-CO）电沉积方法制备了 Zn-Co 薄膜，并评估了其压力对薄膜的影响。还通过常规和典型的超临界-CO（SC-CO）方法制备了薄膜进行对比研究。所有制备的薄膜均通过形貌研究、元素组成、晶体结构取向和显微硬度测试进行了表征。随后，采用动电位极化技术和电化学阻抗技术（EIS）在 3.5wt.%NaCl 溶液中对制备的薄膜进行腐蚀评估。结果表明，通过 US-SC-CO 工艺制备的 Zn-Co 薄膜呈现出球形结节状结构，晶粒尺寸减小，硬度显著提高。在 XRD 研究中，衍射峰位置的偏移表明 Co 离子的比例增加。此外，EDX 结果也证实了这一点，存在特征峰。最后，与其他方法相比，US-SC-CO 工艺的耐腐蚀效率提高了 73.75%。
