Summary for copper plating on copper Discussion
Copper plating on copper was questioned by Rajiv Marwaha, who asked why a copper rod would first receive 0.2 mm of copper plating before machining to tight tolerances and then silver plating for current transfer and rubbing service. The reply suggested several practical reasons rather than a single rule: the plated copper may offer better purity and conductivity than a cast copper rod, silver may adhere better to freshly plated copper than to cast or machined copper, and plating can also help with sizing to reach the required dimensions. The answerer noted that copper can be plated to the specified thickness from an acid copper bath if the part is properly cleaned, deoxidized, and activated. Overall, the discussion points to plating as a way to improve surface quality, adhesion, and dimensional control before the final silver layer.
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Q. We have an application wherein 0.2mm thick copper plating has been recommended on copper rod before machining to tight tolerances and subsequently silver plating to 30-35 microns. This surface is used for current transfer and subjected to rubbing. I am not able to understand the reason for 0.2mm thick copper plating on copper. Can somebody explain ?
Rajiv Marwaha
– Kolkata, West Bengal, India
2005
A. Rajiv
Possible reasons include
-Purity of plated copper and conductivity aspects.As opposed to the suspect purity of a cast Cu rod.
-Adhesion of silver to freshly plated copper is sometimes much better than to cast or machined copper.
– Sizing issues with the rod.
It is entirely possible to plate copper to the specified thickness from an acid copper bath after proper cleaning and de oxidising and activation.
Hope this helps.
Regards
Asif Nurie [deceased]
– New Delhi, India
With deep sadness we acknowledge the passing of Asif on Jan 24, 2016