Chuang Ho-Chiao, Su Hao-Chih, Sanchez Jorge
Department of Mechanical Engineering, National Taipei University of Technology, Taipei 10608, Taiwan.
Department of Mechanical Engineering, National Taipei University of Technology, Taipei 10608, Taiwan.
Ultrason Sonochem. 2019 Oct;57:48-56. doi: 10.1016/j.ultsonch.2019.05.005. Epub 2019 May 8.
This study uses a novel fabrication method of thin metal coatings by Ni electroplating combining ultrasonic agitation with supercritical CO (US-SC-CO) mixed into conventional electrolyte. Coatings were also produced by the conventional and regular SC-CO electroplating methods for comparison. The characteristics obtained from the three fabrication methods such as surface morphology, hardness, roughness; crystallographic orientation, grain size; wear and corrosion resistance were all individually analyzed. Results show that plating quality achieved by US-SC-CO method is superior to that of regular SC-CO and conventional methods. With US-SC-CO process we achieved smoother and more compact surface morphologies, smaller grain size, lower surface roughness and higher microhardness, which also suggests good wear resistance. From XRD analysis we observed changes in preferred orientation due to application of the various methods. From the results of US-SC-CO electroplating and the operating mechanism of ultrasonic agitation we can confirm that this new type of ultrasonic agitation can indeed replace the role of surfactants to enhance coating aspect and properties, reducing their influence over the deposited metal coating, associated costs, and waste. In HSO solution, the nickel coating fabricated by US-SC-CO method displayed the best polarization resistance among the three processes. More detailed experimental results and in depth discussion are presented in this paper.
本研究采用一种新型的薄金属涂层制备方法，即将超声搅拌与超临界CO（US-SC-CO）混合到传统电解液中进行镍电镀。还采用传统的常规超临界CO电镀方法制备涂层以作比较。分别分析了通过这三种制备方法获得的涂层的表面形态、硬度、粗糙度、晶体取向、晶粒尺寸、耐磨性和耐腐蚀性等特性。结果表明，US-SC-CO方法获得的电镀质量优于常规超临界CO方法和传统方法。采用US-SC-CO工艺，我们获得了更光滑、更致密的表面形态、更小的晶粒尺寸、更低的表面粗糙度和更高的显微硬度，这也表明其具有良好的耐磨性。通过XRD分析，我们观察到由于采用了不同方法而导致的择优取向变化。从US-SC-CO电镀的结果和超声搅拌的作用机理可以证实，这种新型的超声搅拌确实可以取代表面活性剂的作用，以改善涂层外观和性能，减少它们对沉积金属涂层的影响、相关成本和废物。在HSO溶液中，通过US-SC-CO方法制备的镍涂层在这三种工艺中表现出最佳的极化电阻。本文给出了更详细的实验结果和深入讨论。
