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Old 25th Nov 2017, 2:48 pm   #25
GW4FRX
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Join Date: Aug 2005
Location: Shrewsbury, Shropshire, UK.
Posts: 149
Default Re: Cleaning PCB track side?

Quote:
Originally Posted by GW4FRX View Post
Sainsbury's lemon juice on the end of a cotton bud doesn't seem to work but maybe it's not acidic enough. Our local Wilko sells citric acid powder so I'll try that.
Tried dissolving one tablespoon of Wilko citric-acid powder in 50ml of hot water and applying via cotton bud. No effect on oxidation even with hard rubbing. Also tried glass-fibre pencil on a scrap PCB. This very effectively removed the entire tinning layer leaving pink-coloured copper beneath, so judged not safe for use on Radford board.

Can anything be done chemically, perhaps with tinning solution? Or perhaps via an ultrasonic bath?
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