Problem? Solution? Chime right in!
(perhaps the world's last 'no registration' site)
"Cleaning copper discoloration from baking"March 29, 2021
Q. Good day to all, hope everyone is safe and well.
We have to oven bake a copper part as part of a soldering process. This sends the copper dull and mis-coloured.
I was wondering if anyone knew if there was any kind of dip chemical that would bring the copper surface back to a lovely clean shine after?
- Birmingham, UK
A. Hi Russ. There are numerous copper & brass polishes which with a little mechanical help will polish the copper. Revere Copper Cleaner is offered for the exact purpose of polishing copper after exposure to heat...
But brightening with just a dip and no mechanical assistance requires stronger chemicals. It's possible that sulfuric acid plus hydrogen peroxide will do it. This should be available from a supplier as a proprietary with instructions, the right ratio, and stabilizers to inhibit the decomposition of the peroxide. This dipping service is probably available from a jobshop as a test of whether it will work, and/or if the chemistry is beyond your shop's ability to safely handle. EPI (Electrochemical Products Inc.) [a finishing.com supporting advertiser] has a video showing the sequence of cleaning, bright-dipping, and de-oxidizing that should meet your needs by being just a sequential dipping process.
Luck & Regards,
Ted Mooney, P.E. RET
Aloha -- an idea worth spreading
finishing.com - Pine Beach, New Jersey