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-----Etching solution process control
December 1, 2010
our solution for etching:
- dissolve in 10 l of demineralised water at 20° C, 6 kg of FeCl3.6H2O
- add carefully 200 ml of HCl (Chloric acid, 36% concentration)
Process:
Dip the wire mesh in the solution for 30 (+5/-0) seconds at (20° C, 68° F).
my questions are:
1.How to maintain the concentration of solution and what standard is used, BAC? PMS?
2.How to monitor the temperature.
Auditor - China
With use, the ferric chloride
⇦ on
eBay or
Amazon [affil link] concentration will rise and the HCl concentration will drop.
You can analyze for the acid content with a titration using a proper indicator. You can analyze for total chloride and subtract the chloride from the acid to get the ferric chloride
⇦ on
eBay or
Amazon [affil link] . This will require removing a calculated amount of solution and adding HCl to bring it back up to level. A few times, it might require a small water addition.
You need to establish limits for both chemicals.
Temperature can be measured with an appropriate temperature measuring device. Normally, this will be a thermocouple with a thin teflon covering of the tip.
The tank should have some method of agitation, with pumped being a normal method.
Normally, you will not use HCl that is that concentrated. It costs too much, and has noxious fumes when making additions.
- Navarre, Florida
December 3, 2010
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