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Would gold conductivity electrodes be as good as carbon, platinum black etc?

Discussion in 'General Electronics' started by My name is Bob, Dec 28, 2006.

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  1. Hi, I want to make a conductivity meter (for salty water) that has to last
    a long time.

    I see a lot of electrodes made out of 'platinum black', carbon or even
    titanium.

    I was wondering if a PCB with two gold plated contacts on it would suffice?
    It seems to me gold is unreactive, with only a very small AC current between
    the two contacts it won't corrode will it?

    I know I could buy one but I want to make it myself.

    Thanks.
     
  2. Robert Baer

    Robert Baer Guest

    You are correct in that gold does not corrode, but be advised that
    current between electrodes means that some kind of compound gets
    "plated" on at least one of the electrodes, thereby contaminating them.
    Also, the plating on copper traces may not completely cover the
    copper (especiallyu the edges); that makes for an electrochemical cell
    right there (possible problems in measurements and electrode lifetime).
     
  3. Thanks again Robert.
     
  4. neon

    neon

    1,325
    0
    Oct 21, 2006
    Plating will never work. you need gold 24 carats too as wires anything else will corode.
     
  5. hi, as far as i know , silver has better conductivity than gold , but the
    problem being is that silver tarnishes easy, whereas gold doesnt , so gold
    is the next best choice.
    mark k
     
  6. hi, as far as i know silver is a better conductor than gold , but silver
    tarnishes easier than gold .
    mark k
     
  7. Jakthehammer

    Jakthehammer Guest


    I recommend using Chromium or stainless with lots of Chromium.
    Conductivity is as good as Gold, cheaper long lasting in solution like salt
    water. Just remember, Do not waste your money on Hydrogen Scam.

    Jack.
     
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