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More on lead-free ...

Discussion in 'Electronic Repair' started by Arfa Daily, Apr 23, 2007.

  1. Arfa Daily

    Arfa Daily Guest

    Hi all

    Following on from earlier discussions regarding the replacement of
    traditional solder with lead-free alternatives, here is a link to the latest
    piece on the subject of lead-free electronics, which I received from one of
    my suppliers a few days back. The last paragraph is particularly
    interesting.

    Arfa
     
  2. Guest

    link?


    NT
     
  3. Eeyore

    Eeyore Guest

    Do go on !

    Graham
     
  4. N Cook

    N Cook Guest

    Its a modern form of lemon juice invisible ink. He used the electrons from a
    lemon+Zn+Cu.
     
  5. Arfa Daily

    Arfa Daily Guest

  6. N Cook

    N Cook Guest

    similarly
    Does anyone know the reason for silver migration around the edges of ceramic
    resonators or the thin element of ceramic filters?. Going ohmic across the
    faces so operational failure.
     
  7. Eeyore

    Eeyore Guest

  8. Sjouke Burry

    Sjouke Burry Guest

  9. Arfa Daily

    Arfa Daily Guest

    Yes, of course I had heard of tin whiskers. I just thought that it was
    interesting to see the latest mutterings about the subject, gathered
    together in one place, and with particular reference to the surface plating
    of the leadouts on electronic components. I dare say that many others
    reading on here have not heard of them, so again, another reason to post the
    link ...

    I also felt that the findings that lead had a beneficial effect in
    preventing the growth of these, was particularly relevant, now that it has
    been largely banned from solder, except in the cases of equipment which is
    responsible for human safety, such as avionics, medical instrumentation, and
    to a debateable degree, military.

    Arfa
     
  10. Chris Jones

    Chris Jones Guest


    I seem to remember reading something about that in "Physical Design of
    Electronic Systems" (which comes in about 6 volumes, by published by Bell
    Telephone).

    I think that the silver migration is affected by the presence of DC voltages
    and maybe humidity etc., whereas nobody knows how to accelerate tin whisker
    growth, (so we'll have to wait X years before we find out that everything
    produced in the last X years is going to fail.....)

    Chris
     
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