Study on the internal stress of nickel coating electrodeposited in an electrolyte mixed with supercritical carbon dioxide

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• 作者：V.C. Nguyen^a ; C.Y. Lee^a ; ^{leech@ntut.edu.tw} ; F.J. Chen^b ; ^c ; C.S. Lin^b ; T.Y. Liu^a
• 关键词：Internal stress ; Supercritical carbon dioxide ; Nickel electroplating
• 刊名：Surface and Coatings Technology
• 出版年：2012
• 期刊代码：106_02578972
• 类别：ms
• 出版时间：15 March, 2012
• 卷：206
• 期：14
• 页码：3201-3207
• 文件大小：1903 K

摘要

This study focuses on the internal stress in the nickel deposit during electroplating through the additive-free Watts bath electrolyte mixed with and without supercritical carbon dioxide (Sc-CO₂). The results showed that the Ni films plated in Sc-CO₂ had brighter, smoother surface and higher hardness than plated in conventional electrolyte without Sc-CO₂. However, there existed more nano-sized pinholes via TEM and AFM measurements in the Sc-CO₂ specimens. It was found that during electroplating the Sc-CO₂ occluded into the coating through the nano-sized pinholes/voids influenced the internal stress of the deposit. On the other hand, the periodic plating characteristics of the Sc-CO₂ electroplating led to higher relative peak magnitude of Ni {111} over {200} in crystalline orientation revealed in X-ray diffraction patterns. As a result, the internal stress in the nickel film plated through the Sc-CO₂ method was significantly higher than that in the conventional one. Moreover, the more CO₂ volume fraction used in Sc-CO₂ electroplating resulted in even higher internal stress of nickel film.