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Cleaning leaked electrolytic & corrosion on PCB

Discussion in 'Electrical Engineering' started by DaveC, Apr 10, 2010.

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  1. DaveC

    DaveC Guest

    What is the best method for cleaning up leaked electrolyte? This PCB has some
    corrosion on IC leads and vias.

    Is there a corrosion neutralizer that would be effective? Since the potential
    for corrosion in places that aren't accessible (deep in the vias), a liquid
    that can neutralize corrosion is called for.

    Would something like DeOxit work in such an application?

    This is on a Tek scope acquisition board.

  2. N_Cook

    N_Cook Guest

    litmus test first to see of acidic or alkaline and go for the opposite as
    cleaner ?
  3. James Sweet

    James Sweet Guest

    I scrub with white vinegar and a toothbrush, then rinse with alcohol. If
    the corrosion is more severe, mechanical methods may be needed,
    Scotchbrite type cleaning pads work well but you have to be careful not
    to damage fine traces. In some cases it's best to neutralize and then
    clean off as much residue as possible and then leave the remaining
    corrosion alone.
  4. James Sweet

    James Sweet Guest

    You can always do it while the wife is out, it's not gonna damage anything.

    When I was a teenager I occasionally washed engine parts in the
    dishwasher, not something I'd recommend, but my mom never found out.

  5. Just be sure to do a 60 C bake for about a half hour afterward.
  6. Nico Coesel

    Nico Coesel Guest

    Hmm, you bought a TDS5xx? There is a lot about cleaning these board on
    the Tektronix user forum on their website.
  7. ["Followup-To:" header set to]
    Excellent advice. A household dishwasher (with the normal powder
    detergent) is an extremely cheap and powerful cleaning device for almost
    anything. It took me a while to convince my ex-lab to use one for
    cleaning larger UHV parts rather than an appropriately-sized ultrasonic
    tank which would have cost the equivalent of 100 dishwashers. There are
    things that a dishwasher isn't good enough for, but they are few.

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