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Thread: Question on Cad Plating & Best Way to Remove

  1. #1
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    Question on Cad Plating & Best Way to Remove

    Need to know if cad plating was the only plating used by suppliers back in day either in gold or silver? on a 1970 built 911 coupe. I was just informed by my plating guy that any parts with cad plating will have to be stripped before he can plate them. What will remove the cad plating without damaging threads. Was Zenith 40 carb hardware cad or? Maybe better to tell me what wasn't cad plated on 70's 911.

    Thanks in advance for any info

    Hopper

  2. #2
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    Quote Originally Posted by hopper View Post
    Need to know if cad plating was the only plating used by suppliers back in day either in gold or silver? on a 1970 built 911 coupe. I was just informed by my plating guy that any parts with cad plating will have to be stripped before he can plate them. What will remove the cad plating without damaging threads. Was Zenith 40 carb hardware cad or? Maybe better to tell me what wasn't cad plated on 70's 911.

    Thanks in advance for any info

    Hopper
    Pretty sure that yellow zink was the plating of choice in 70. Cad or zink can be easily removed with fine glass beads and won't do any damage to the metal.

    Regards

    Jim

  3. #3
    Senior Member Fishcop's Avatar
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    I'm sure they were zinc too. A weak solution of hydrochloric acid removes zinc - just wait for the fizz to stop and they're done.
    John Forcier
    EarlyS #1987
    1968 911 Race Car "Grun Hilda"
    1969 S/T interpretation "Blau Healer"
    Restoration Saga

  4. #4
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    I thought I read somewhere that the early 911's plated parts were cad plated, if indeed the plated parts were zinc coated then I don't have to remove zinc as my plater said, goody less work as the only way I was thinking of removing the plating was one piece at a time on a brass wire wheel, fun wow, my back was aching just thinking about it.

    Thanks

    Hopper

  5. #5
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    From the post below,

    http://www.early911sregistry.org/for...on-911-s/page2

    In particular post #13 by smedley

    "For the LAST time......cadmium plating disappeared with rare exception in the late 50s.

    The plating on late 50s 356s and all 900 cars was zinc, repeat zinc!! This has been reinterated by several 356ers and 911 guys who have consulted platers and metallurgists. Lew Morman, long time PCAer, autocrosser and concour guy....AND metallurgist for Champion Sparkplug set me straight on this back in the 70s.....all of the platers since then that I have worked with in Indianapolis, Chicago, and now Sacramento have confirmed this.

    The plating used on fasteners is an industry/DIN thing not Porsche.

    Later 356s had silver or "clear" zinc. Sometime in the late 60s the industry started using a phosphate wash which coated the zinc yellow/green. We see this transition when Porsche made their supply orders for the 900 cars, and they stated receiving yellow zinc. It is well documented among the 356 crowd that yellow started appearing more on '65 C cars. Conversly, early 900 cars had some left over clear zinc.

    The rare exception? Recaro had all of their slider rails and levers done in real silver cadmium. Again, I had professionals in the business verify this. Those of you who have worked on or dismantled cars know that the rails and levers on these early cars show more corrosion and "chalking out" of the plating......which is why the industry went away from cadmium."
    Mark Smedley
    RG #171
    1971 911 T Non-Sunroof Coupe
    1984 944 Original Owner
    1989 911 Targa

  6. #6
    Any plating guy who can't handle cad (which yours isn't) isn't getting my car. Especially one who thinks my zinc is cad.
    Kenik
    - 1969 911S
    - 1965/66 911
    - S Reg #760
    - RGruppe #389

  7. #7
    It's probably a hazmat thing.
    1966 911 #304065 Irischgruen

  8. #8
    Vintageracer John Straub's Avatar
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    Hasmat has killed it in San Diego...

    John
    1965 911 #301111, Red Book Vol 1 "Cover Car," owned 53 years.
    1967 911 #307347, bare-bones, some road wear, a little surface rust, and a few dents..., owned 13 years.
    1970 914/6GT, (Sold - ran the last three Rennsports)owned 30 years.


    Photography Site: JohnStraubImageWorks.com

    Registry #983
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