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Applying cadmium on nitrided surface



2002

We have parts made from 15-5ph h110 condition which are required to be liquid salt bath nitrided per AMS2753 [affil. link to spec at Techstreet]. The problem is that our print requires us to cadmium plate over the nitride per QQ-P-416 [link by ed. to spec at Defense Logistics Agency, dla.mil] type II class 2. Several platers have tried unsuccessfully to get the cadmium to adhere to the nitriding. Shot blasting after nitriding helps but is inconsistent. Any suggestions?

JULIAN FERNANDEZ
- Harwood Heights, Illinois, USA


2002

You might want to look into vacuum cad deposition. Basically, rather than using a wet solution, the cadmium is evaporated onto the parts in a vacuum chamber. I would expect the adhesion to be much better. This is a commercial process, so you shouldn't have any trouble finding a source. Check the listings of commercial suppliers at this site.

jim treglio portrait
Jim Treglio - scwineryreview.com
PVD Consultant & Wine Lover - San Diego, California


2002

Julian,

You have to ask your nitride supplier to reduce the white layer during his process (by the double stage I believe). This layer forms spontaneously on top of the steel and does not accept any plating easily. Then, implement a method to further eliminate it yourself. Blasting is a good way but has to be perfected and controlled to yield desired results.

Guillermo Marrufo
Monterrey, NL, Mexico

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