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topic 11501

Pickling of copper washer to maintain its shining


How is the shining of the copper maintained for a long period after annealing.What is the procedure for pickling.

Vikram Kirad
United Gaskets & Components Pvt.Ltd. - Pune, Maharashtra, India


Wash the copper washers in chromic acid solution.

Ajay Aggarwal
Ajay - Panchkula, Haryana, India


With stricter pollution laws in the country chromic acid solution is only increasing your effluent costs. Also, your requirements can be easily met with the new generation chromate free solutions.

Of course you will not be able to get the finish of chromate on copper, which is different than all others, however, you can get good corrosion resistance.

If your copper washers are shining when they are freshly, there is no reason why you should not be able to maintain it that way, without chromate.


S. Kundra
- Bombay, Maharashtra, India

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