Cadium vs Zink - Team Camaro Tech
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post #1 of 10 (permalink) Old Dec 17th, 02, 08:52 AM Thread Starter
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My winter project has now moved to detailing the brake caliper mounting brackets and backing plates. My books call for Cadium Dichromate. The guy who does all the plating in the area says he can do it but he uses "Zink" not Cadium and that no plating shops do Cadium plating anymore. What do you guys think? Thanks, John
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post #2 of 10 (permalink) Old Dec 17th, 02, 07:28 PM
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He is right. Cadmium was determined to be too toxic many years ago.
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post #3 of 10 (permalink) Old Dec 18th, 02, 12:53 AM
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Zinc plating is the chosen coating for external environment, other than Stainless steel Series 316, used on marine applications.

If for the suspension and brakes, stick with Zinc plated. Hopefully, the plater hasn't overcooked the fasteners when bathing before plating...this will affect the hardness of the bolt.

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post #4 of 10 (permalink) Old Dec 18th, 02, 03:30 AM Thread Starter
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Once again you guys have proven to be so helpful. Thankx, John
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post #5 of 10 (permalink) Old Dec 18th, 02, 06:09 AM
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I think there's a visible difference between cad and zinc plating. I had my brackets gold cad plated and my backing plates white cad plated by mailing them to Jerry MacNeish.





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post #6 of 10 (permalink) Old Dec 18th, 02, 09:02 AM
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Looks great--you even riveted your ball joints, huh.
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post #7 of 10 (permalink) Old Dec 18th, 02, 09:43 AM
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I had to use oversized rivets because the original-size rivets don't fit the oblong'ish hole in the new ball joints. But, yeah, I riveted them in. Even painted them black later on to match the original.
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post #8 of 10 (permalink) Old Dec 19th, 02, 02:03 AM Thread Starter
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deejaygee, fantastic picture. My plater said the zink look is "not" the same, as you pointed out. Brighter I think. Do you have any more pictures of that scope of your project? One w/ caliper installed? Thanks for the help. John
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post #9 of 10 (permalink) Old Dec 19th, 02, 06:10 AM
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post #10 of 10 (permalink) Old Dec 20th, 02, 11:27 AM
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Cad plating stopped in most places many years ago when cadmium was identified as a carcinogen. Pure cad plating was silver-colored, just like zinc, BTW; many platers add a dichromate dip after zinc plating (like they used to do with cad) to get the "gold" and multi-hued appearance.

OEM fasteners that used to be cad-plated were silver-colored; now they're zinc-plated instead and are still silver-colored. Make sure any fasteners you have commercially plated are annealed afterwards - otherwise you run the risk of hydrogen embrittlement, and they'll fail (sounds like a rifle shot when they pop).

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