To "ZINC" or to "CAD" that is the question! | FerrariChat
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To "ZINC" or to "CAD" that is the question!

Discussion in 'Technical Q&A' started by christopher, Oct 14, 2006.

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  1. christopher

    christopher Formula 3

    Nov 29, 2003
    1,136
    Ontario California
    Full Name:
    Christopher
    #1 christopher, Oct 14, 2006
    Hello Fellow "F"-Chatters,

    I'm working with a 79 308GTB, as I take the nuts/bolts/washers and etc. I've been taking them to a plate shop for zinc plating. I guess my question is how many of those item were in fact actualy "zinc" plated or "cad" plated. Obviously I'd like to do the correct plating on the correct items. Apprecaite your help!

    Thank you,

    Chris.
     
  2. Paul_308

    Paul_308 Formula 3

    Mar 12, 2004
    2,345
    #2 Paul_308, Oct 14, 2006
    I wasn't in Italy at that time, but in the US (early '60s I worked daily with MIL-F-14072), protective finish of choice for ferrous metal fasteners was cad iridite. Since then, environmental concerns have switched the military, electronics, and automotive users to lesser quality, but adequate, zinc and nickel coatings. Cadmium allows an extremely thin coating soas not to affect part tolerances.

    The platings must also be coated with a chromate (iridite). Chromates can be clear but is commonly specified light yellow to visually prove the chromate process was done...otherwise a chemical test of proof must be performed or the parts tossed as without chromate you will still get pinhole rusting

    You may find this thread of comparisons interesting:
    http://finishing.com/130/89.shtml
     

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