PCB copper oxidation

Discussion in 'The Projects Forum' started by Garurumon, Sep 6, 2013.

  1. Garurumon

    Thread Starter Member

    Mar 17, 2013
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    I'd like to protect my finished PCB's from corrosion, but I do not have access to any PCB plating sprays and stuff.

    I heard that some people practice puting the flux all over the board to protect it. Now, I have a bunch of rosin (colophony), but I don't know how to disolve it :D

    When I use it, i just dip the tip of my iron in it, and then continue soldering.

    Anyone knows if flux protection is effective, and if yes, how to dissolve colophony and apply it over PCB copper?
     
  2. kubeek

    AAC Fanatic!

    Sep 20, 2005
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    You can crush the rosin into fine powder and then dissolve it in isopropyl alcohol, but i don´t think that rosin is a good way to impregnate your boards, the layer will tend to stay sticky for some time so it will gather all the dust from around.
    Try looking for some conformal coating spray or similar pcb laquer.
     
  3. Garurumon

    Thread Starter Member

    Mar 17, 2013
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    well, the projects goes into the sealed box right away :)

    but rosin would prevent oxidation?
     
  4. mcgyvr

    AAC Fanatic!

    Oct 15, 2009
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    Conformal coating spray? (about $25.00 a can)
    tinning of the traces?
    polyurethane varnish?

    There are plenty of products that "could" be used.. Flux is not one I would ever choose. (mostly because its going to be UGLY)
     
  5. MrChips

    Moderator

    Oct 2, 2009
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    Spray urathane lacquer over the board.
     
  6. Garurumon

    Thread Starter Member

    Mar 17, 2013
    99
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    would acrylic work?
     
  7. MrChips

    Moderator

    Oct 2, 2009
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    Yes. But if you want better protection, use conformal coating.
     
  8. joeyd999

    AAC Fanatic!

    Jun 6, 2011
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    There are electroless tin plating solutions available. Just dip your board in the solution, and you done.

    Oh...you need to do this *before* populating the board.

    PS -> this is how I did it when I was a kid (~10 y.o.).
     
  9. #12

    Expert

    Nov 30, 2010
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    I use Krylon Clear. But then, I don't know if you can buy Krylon in the country where colophony is a well known word.
     
  10. bountyhunter

    Well-Known Member

    Sep 7, 2009
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    Use clear urethane spray. Buy it at any Home Depot.
     
  11. MaxHeadRoom

    Expert

    Jul 18, 2013
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    +1 on the Conformal C.
    Max.
     
  12. DickCappels

    Moderator

    Aug 21, 2008
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    I know a guy who spray paints his boards different color. I agree with #12: "If you prize it, Krylonize it."

    Flux is a bad idea, many fluxes are poor insulators.
     
    Last edited: Sep 9, 2013
  13. GopherT

    AAC Fanatic!

    Nov 23, 2012
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    What the hell, did #12 get a promotion? Why didn't it get posted somewhere? What is his new title (what was his old title)?
     
  14. kubeek

    AAC Fanatic!

    Sep 20, 2005
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    If he got a promotion, shouldn´t he become #11?
     
  15. GopherT

    AAC Fanatic!

    Nov 23, 2012
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    Good point. There is obviously some sort of scandal, confusion or typographical error going on and someone should get to the bottom (or top) of this!
     
  16. sirch2

    Well-Known Member

    Jan 21, 2013
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    Genuine question: is conformal coating really much better than other paints and lacquers? I've coated a few boards with clear lacquer intended for things like alloy wheels and it seems to work fine, what advantages does conformal coating have?
     
  17. DickCappels

    Moderator

    Aug 21, 2008
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    I have corrected the inadvertent demotion of #12. Thanks for catching the typo.

    Lacquer is a conformal coating. What kind of conformal coating do you wish to compare lacquer?
     
  18. sirch2

    Well-Known Member

    Jan 21, 2013
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    The stuff available from car parts shops for £5.00 against the stuff called conformal coating sold by electonics parts suppliers for £15.00
     
  19. kubeek

    AAC Fanatic!

    Sep 20, 2005
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    It could be that the electroincs stuff is carefully tested so that no aggressive chemicals leach out of it over long time periods (say 20-30 years), that it´s parameters like resistivity and permittivity are known and controlled, and maybe some other aspects too.
     
  20. sirch2

    Well-Known Member

    Jan 21, 2013
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    I guess that could be it
     
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