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Fundamentals of Speculum
I am a regular subscriber of your Metal finishing magazine. We are getting many enquiries for nickel-free plating for Gold and Silver.We knew about the copper-tin alloy plating as it can be used instead of nickel.Sir if you can provide me the technical formulation of the bath and the trouble-shooting through e-mail.
I would be keenly waiting for your prompt reply as soon as possible.
Dear Mr Pritesh Jain ,
The Copper - Tin process process you want is a proprietary process offered by Enthone - OMI , however from reports I have from users in the UK & elsewhere, it requires a lot of control .
A simpler approach might be to consider Bright Acid Copper , followed by a Palladium strike and then Gold . I have seen such a process in operation and it works .
Depending on the metals being plated you may need to consider a Cyanide Copper process prior to the Acid Copper .
As the Palladium & Gold processes are proprietary , you would need to contact one of the major precious metal plating suppliers .
- Victoria Australia
The Enthone process may require no more control than for other copper-tin processes- Speculum is a hard silvery-white alloy containing approximately 42 percent tin.
Falls Township, Pennsylvania