In article ,
Jan Wysocki wrote:
I usually just scrape with the edge of a blade. I was hoping someone had a
chemical solution. That didn't cause problems later on - like an
aggressive flux can if not completely removed afterwards.

Don


I've come across this many times with old wiring looms. The copper
oxide film appears to form all along the wires, under the sheath. I dip
the exposed copper in warm dilute acid: usually citric - sulphuric or
hydrochloric would be quicker. (IIRC sulphamic acid doesn't work.) Stop
when the copper is errm, copper cloured. Rinse it well afterwards with
boiling water.

Thanks - I'll give that a try when I next come across it.

Scraping is ok for single core, but not good enough
for soldering multicore. I guess that a fibreglass brush could work
on multicore.

--
*I wonder how much deeper the ocean would be without sponges*

Dave Plowman London SW
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