Liu Shuo, Qiao Xiaojing, Liu Weinan, Shi Shaomei, Qu Yang
School of Mechatronical Engineering, Beijing Institute of Technology, Beijing 100081, China.
School of Mechatronical Engineering, Beijing Institute of Technology, Beijing 100081, China.
Ultrason Sonochem. 2019 Apr;52:493-504. doi: 10.1016/j.ultsonch.2018.12.030. Epub 2018 Dec 19.
The carbon fibers were ultrasonically treated under nickel chloride solution, and nickel ions were attached to the surface of the carbon fibers, which replaces the nitric acid oxidation method used in the original electroless nickel plating. Electroless nickel plating was performed on the surface of the carbon fibers using a palladium-free technique successfully. Nickel-plated carbon fibers with a higher weight gain ratio than the original method was obtained. XPS was used to study the functional group changes on the surface of carbon fibers and the chemical valence of nickel element. The mechanism of ultrasonic treatment on the surface of carbon fibers was analyzed, and the effect of ultrasonic treatment on the weight gain rate of nickel-plated carbon fibers was discussed. The results show that the ultrasonic treatment under nickel chloride solution can significantly increase the content of polar functional groups on the surface of carbon fibers and can promote the bonding of the carboxyl group on the surface of the carbon fibers with the hydrated nickel ion to form CFCOONi. The formation of CFCOONi enhances the bonding strength between the nano-nickel particles and the carbon fibers, thereby increasing the bonding strength between the plating layer and the substrate. The concentration of nickel chloride solution and ultrasonic power during ultrasonic treatment has a great influence on the weight gain rate of carbon fibers after electroless plating. When the concentration is greater than 10 g/L, the higher the concentration, the smaller the weight gain rate. When the treatment concentration is less than 10 g/L, the concentration has little effect on the weight gain rate. The optimum treatment concentration obtained in the experiment was 7 g/L. As the ultrasonic power increases, the weight gain rate increases first and then decreases, and the optimal ultrasonic power is 80 W. Ultrasonic time does not have a large effect on the weight gain rate, but the too low ultrasonic time will cause a slight decrease in the weight gain rate.
将碳纤维在氯化镍溶液中进行超声处理，镍离子附着在碳纤维表面，这取代了原化学镀镍中使用的硝酸氧化法。成功地采用无钯技术对碳纤维表面进行了化学镀镍。获得了增重率比原方法更高的镀镍碳纤维。利用X射线光电子能谱（XPS）研究了碳纤维表面官能团的变化以及镍元素的化合价。分析了碳纤维表面超声处理的机理，并讨论了超声处理对镀镍碳纤维增重率的影响。结果表明，在氯化镍溶液中进行超声处理可显著增加碳纤维表面极性官能团的含量，并能促进碳纤维表面羧基与水合镍离子结合形成CFCOONi。CFCOONi的形成增强了纳米镍颗粒与碳纤维之间的结合强度，从而提高了镀层与基体之间的结合强度。超声处理过程中氯化镍溶液的浓度和超声功率对化学镀后碳纤维的增重率有很大影响。当浓度大于10 g/L时，浓度越高，增重率越小。当处理浓度小于10 g/L时，浓度对增重率影响不大。实验得到的最佳处理浓度为7 g/L。随着超声功率的增加，增重率先增大后减小，最佳超声功率为80 W。超声时间对增重率影响不大，但超声时间过短会导致增重率略有下降。
