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>Detailed investigation of the rejuvenation of a spent electroless nickel solution by electrodialysis with a view to optimizing electrodialysis performance
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Detailed investigation of the rejuvenation of a spent electroless nickel solution by electrodialysis with a view to optimizing electrodialysis performance
The rejuvenation of spent electroless nickel baths by electrodialysis has received a considerable amount of attention over the past decade and the technique is being increasingly employed to extend electroless nickel bath life. However, thus far there has not been a detailed investigation into the optimum electrodialysis operating conditions and into the best ion selective membranes and cell configuration that could be used. Along with providing a brief review of the progress in the use of electrodialysis to extend the electroless nickel bath life, this paper shall present the results of electrodialysis trials carried out at four different critical cell operating conditions i.e. current density, pH, flow rate and temperature. The effectiveness of the electrodialysis technique at each operating condition shall be assessed with regard to parameters such as total ion removal, permselectivity and current efficiency. This work also provides for monitoring the fate of all the anions and cations in the electroless nickel bath during the electrodialysis process by using ion chromatography and inductively coupled plasma spectroscopy as analysis techniques. Once the optimum operating conditions have been established it is then planned to test and compare different ion selective membranes and to experiment with different cell configurations.
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