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Ted Mooney, P.E. RET
Pine Beach, NJ

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Copper washer identification

I would like to know if any process exist to coat copper washers of varying thickness with various colors for identification. The coating should be of max 10micon thick & it should not peel off at high temperature.

Narasimha Prasad
- Bangalore, India

This question could be answered easily by sending some graphs.

For iron-content in pickling acid there is a graph to read the iron, when you have the acid-content(simple titration) and the density.

For maximum iron content (saturation) at a certain temperature there are graphs iron(chloride) vs. HCl.

Dolf van den Berg
- Leusden, The Netherlands

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