The need to extend the operating life of electroless nickel solutions is as old as the technology itself. Over time, decomposition products and the remaining sulfate from the nickel, will reach a critical level, thereby limiting solution usefulness. Apart from the obvious costs involved in repeated solution make-up, replenishments and disposal, the main motivation for increasing the operating life is the desire to operate under constant working conditions and provide consistent deposit properties. Most known life-extending techniques are costly and/or involve production interruptions. This paper will discuss a new chemical answer to long life electroless nickel plating.
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