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topic 12185

Pickling of Copper Washers


 

We are making copper washers. Is there a defined method to pickle copper washers so that it shines and do not become blackish.

Vikram Kirad
gaskets & components - Pune, Maharashtra, India


1st of two simultaneous responses--

I would recommend using a peroxide-based bright dip followed by a triazole containing corrosion inhibitor. This will provide some tarnish resistance, but won't last forever. To keep the parts bright for long periods of time, a clear chromate finish or a lacquer sealer may be what is needed.

Dan Brewer
chemical process supplier - Gurnee, Illinois


2nd of two simultaneous responses--

What you are looking for is a bright dip, not a pickle. The bright dip has many formulations, but will typically contain some nitric acid and some chromium 6. I would suggest finding several formulations from several sources and try each of them in the lab. The exact copper alloy and temper will make a difference as to which one will work best.

James Watts
- Navarre, Florida


 

We also manufacture copper washers. Pickling won't solve your problem.Copper due to the material nature gets oxidised quickly when exposed to atmosphere. The best way to have a highly concentrated sulphuric & nitric acid bath, then it has to be rinsed with water ( preferably soft water). Then it is dipped in a solution ( Copper finish solution)

Thanks

Karwar Industries
- Mumbai, India



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