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Cleaning up circuit boards after soldering

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Cleaning up circuit boards after soldering

Postby Sam Spoons » Thu Nov 22, 2018 9:58 pm

Any suggestions how to clean flux residue of the pretty white PCB on my Rackit Baby 8 kit?
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Re: Cleaning up circuit boards after soldering

Postby Eddy Deegan » Thu Nov 22, 2018 11:53 pm

I happened to be on the phone with an Uncle of mine when I saw this post (he designs industrial and medical power supplies for a living) and he said it depends quite a lot on the flux but in the absence of more information isopropryl alchohol and a bit (possibly more than a bit) of elbow grease is a fairly safe bet as it doesn't attack plastics or upset electronic components.

He also said not to use a mechanical device such as a Dremel or similar to do the rubbing, as the vibrations can sometimes not play nice with circuitry.
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Re: Cleaning up circuit boards after soldering

Postby Folderol » Fri Nov 23, 2018 12:10 am

Another isoprop user here :)
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Re: Cleaning up circuit boards after soldering

Postby Hugh Robjohns » Fri Nov 23, 2018 12:19 am

Yep, I use Isoprop and an old toothbrush.

H
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Re: Cleaning up circuit boards after soldering

Postby ef37a » Fri Nov 23, 2018 1:54 am

The network hardware co I worked for made millions of joints a year and were told by one solder supplier that the flux residue actually protected the joints from atmospheric attack.

Then I went to J Beam Aerials and the joints were scrubbed with a 25mm paint brush, bristles cut down to 20mm or so to make it stiff and litres of a proprietory flux cleaner sloshed about! Yer pays yer money....

Personally I have never known flux residue to do any harm but I have seen white, corroded solder joints.

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Re: Cleaning up circuit boards after soldering

Postby Dan LB » Fri Nov 23, 2018 2:57 am

Hugh Robjohns wrote:Yep, I use Isoprop and an old toothbrush.

H


^This. Same here.
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Re: Cleaning up circuit boards after soldering

Postby Sam Spoons » Fri Nov 23, 2018 11:05 am

Cool, thanks all, it's purely for cosmetic reasons. I wouldn't normally bother but it's a Rackit Baby 8 sequencer and the PCB is on show all the time. I have isopropyl alcohol and old toothbrushes so I'll go to it with those.
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Re: Cleaning up circuit boards after soldering

Postby Folderol » Fri Nov 23, 2018 11:24 am

For D.I.Y. stripboad stuff I often won't bother, but for finished 'proper' PCBs I'll always give them a clean, then when dry a quick spray of PCB varnish - no risk of fur coated trackwork then :)
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