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Is there a way to remove corrosion off electronic components?
Refrigerator:
I scored a 3000 piece roll of optocouplers at the flea market, problem is they've been stored in a very damp environment and have corrosion on their legs, which makes it impossible to solder them.
They only cost me 1€, which is not a huge loss, but i mean do i really have to throw them all out? :-//
So far i've tried vinegar, battery acid, concentrated muriatic acid and caustic oven cleaner and none seem to help, any suggestions? |O
I have some copper chloride etching solution so i might give that a try.
Refrigerator:
As luck would have it, copper chloride etching solution is perfect at removing the corrosion.
After just a few minutes the optocouplers become perfectly solderable :-+
Case closed 8)
But just in case post what you know about removing corrosion off components ;D
PS: in the picture you can just about see a dark cloud around the optocouplers as they soak in the etchant, which is material being removed. So my etchant is not just self-plating copper as it tends to do on stainless steel tweezers, for example.
Faranight:
What concentration of CuCl2 did you use for etching?
EDIT: Also, you may want to re-tin those pads after etching them because exposed copper (assuming the pads are copper) may oxidize over time when exposed to air. I hear there are some tinning solutions available that may do the job.
DavidAlfa:
Did copper chloride fully clean the black tin oxide or was it just "good enough"?
About 2 months ago I had to refurb a Tek TG501, everything was badly oxidized, see attached pictures.
Not wanting to take unnecesary risks as lots of parts were unobtanium, I replaced every socket and brushed all the ics by hand.
strawberry:
like this? desolder all components. scrape off rust layer and dip in acid. some transistors pins corroded off down under glass
VEF elektroakustiskais agregāts
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