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Anti rust device schematic

Discussion in 'Electronic Basics' started by ZhangLu, Oct 31, 2006.

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  1. ZhangLu

    ZhangLu Guest

    Hi, I'm looking for a schematic to construct a anti rust device, to be
    fitted to a 12v car. Can anyone help?
  2. default

    default Guest

    I think they only work well with boats where the metal parts are
    always in contact with the water. The idea is simple and only takes
    an op amp and perhaps driver transistor. You measure the voltage
    being produced by the galvanic action of dissimilar metals and apply
    enough current to another electrode to cancel the galvanic voltage.

    Unless all the parts are bonded - connected together electrically - it
    won't work. Unless the electrode and parts being protected aren't wet
    at the same time by the same electrolyte, it won't work.

    If it were that easy - you could just bolt a sacrificial anode (zinc)
    to the car and be done with it - that technique has worked well for
    many years in boats.

    Things to search for are "active cathodic protection"

    I knew a guy with a boat who was paying the dockmaster to look after
    it. He complained that the zincs, he added, where being eaten away in
    no time - and plating out on the bronze parts below the water line.
    So I went out to look at it - it had an active rust prevention scheme
    already in place. That suggests, to me, that had he had galvanized
    fittings below the water line they might be eaten away leaving the
    iron exposed - but I don't know for a fact. I just told him to use
    one system or the other, but not both.
  3. nobody

    nobody Guest

    Years ago there was a product called "Rust Buster" that was a small
    impressed current device attached to your battery and having several
    anodes attached to the autobody parts. IT DID NOT WORK.

    For this system to work the vehicle must be submerged in an electrolyte.
    Condensation, and rain doesn't provide an adequate layer for cathodic
  4. Baron

    Baron Guest

    Didn't they turn car batteries around a few years ago because someone
    discovered that it reduced corrosion of the car body ?
  5. jasen

    jasen Guest

    I've seen the device (well a mockup on a coulter) I have no idea how they
    "polarise the paint" or whatever it is they actually do, or if it works.

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