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Plating of pot metal or die cast

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Pot metal/die cast tin plating.

I would like to tin plate over pot metal and die cast pieces that were originally chrome plated. I currently have a small electro tin/zinc plating kit that works very well on steel parts to plate a 99.9% tin plating.

1. How do I strip the chrome plate?

2. Can I do an electroless copper plate then proceed to the electro tin plate?

3. Is there any type of plating that will fill small pits in the metal? OR can I use a type of filler?

Any help is greatly appreciated. Thank you.

Mark

Mark Robidoux
- Malvern, Pennsylvania


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1. Hi, Mark! You haven't told us the setting in which you intend to do this, so it is difficult to answer your question. That is, the chrome can certainly be stripped off, but I would not want to tell an untrained individual over the Internet how to use the required toxic chemicals. If you use the alkaline electrostripping method the chrome metal is converted to carcinogenic hexavalent chrome waste.

2. To my knowledge you can not electroless copper plate these materials, and even if you could, it would probably be a poor base for subsequent electroplating. You would need to cyanide copper plate them, although it is possible that a proprietary copper pyrophosphate might work.

3. The most professional approach would probably be to copper electroplate the items and then mush buff them to try to fill in the pits, but there are filler materials for the less rigorous applications. Good luck.

pic of Ted Mooney Teds signature
Ted Mooney, P.E. RET
finishing.com
Brick, New Jersey

March 4, 2008

Pot metal plating; There is a video on our web site (customchromerestoration.com) that shows the chrome plating restoration process. I believe the video will answer the questions about pot metal repair.

Trevor McBride
- Conneaut Ohio

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