Replacement for Cadmium Plating of Stainless Steel
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Re: Replacement for Cadmium Plating of Stainless Steel
Re: Replacement for Cadmium Plating of Stainless Steel -- TonyN	Post Reply	Top of thread	Forum

Posted by: Kelly Bramble ® 02/22/2007, 15:02:57 Author Profile eMail author Edit

Are you sure there is cadmium plating of the 416 SS part? Normally, one would only require a passivate, Zinc Plate, Black Zinc, or black oxide. Regular steel gets Cadmium... In general, Cadmium plating does not change the dimensional sizes of the plated part. Also, specifying dimensional limits after plating operations can be tricky business for manufacturers since controlling the plating thicknesses for some plating operations is a art. If the material is realy Stainless steel, then I would consider Zinc Plating.

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Re: Re: Replacement for Cadmium Plating of Stainless Steel
Re: Re: Replacement for Cadmium Plating of Stainless Steel -- Kelly Bramble	Post Reply	Top of thread	Forum

Posted by: TonyN ® 02/22/2007, 15:48:52 Author Profile eMail author Edit

Thanks, Kelly for the FAST response (WOW)! The AI indexes between my passivated 416 part and my customer's 6061 Alum structure are so far apart, my customer specified that the 416 part of the interface be Cadmium plating per AMS-QQ-P-416A Class 3 (.0002" minimum thickness). As you said, we have been struggling to control the post-plating size of the 416 part FOREVER. Ion-Vapor-Deposited (IVD) Aluminum per Mil-C-83488 was recommended as a replacement for cadmium plating. People say that a part can be machined to a finished size, post-processing. I am very skeptical. I just don't know how well it works.

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Re: Re: Replacement for Cadmium Plating of Stainless Steel
Re: Re: Replacement for Cadmium Plating of Stainless Steel -- Kelly Bramble	Post Reply	Top of thread	Forum

Posted by: CCR5600Design ® 02/22/2007, 15:41:36 Author Profile eMail author Edit

Would it be possible to anodize the aluminum part to help control dissimilar metal decomposition? "What we need are more people who specialize in the impossible." - Theodore Roethke

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Re: Re: Re: Replacement for Cadmium Plating of Stainless Steel
Re: Re: Re: Replacement for Cadmium Plating of Stainless Steel -- CCR5600Design	Post Reply	Top of thread	Forum

Posted by: randykimball ® 02/22/2007, 19:44:07 Author Profile eMail author Edit

I have seen many aircraft part with size specified after processing and requiring the pre-process size be controled with thickness of processing considerations. It is more expensive but can be done. I have even had to machine, grind, polish, or burnish parts after process to meet size and occasionally even have seen it required on the face of a print. It takes more skill at the plater and sometimes requires multi dips into the vats. The point is it sure cuts down on the tolerance the shop has for machine purpose and I highly DO NOT recommend it. Now days nitride process is popular as it has very little effect on material size. It can provide a surface over 60RC and wears well. However, I have no clue as to how it performs as a dis-similar metal electrically. It may be worth researching via a phone call to a processor to learn about those properties as well as to which materials it can be applied. The worst suggestion of your lifetime may be the catalyst to the grandest idea of the century, never let suggestions go unsaid nor fail to listen to them. Modified by randykimball at Thu, Feb 22, 2007, 19:49:46

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