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topic 10722

Zinc-Nickel versus IVD Aluminum as a replacement for Cadmium plating


 

We consider stopping using Cadmium plating due to environmental reason. I wonder which of the two processes would fit better and why?

Any comment would be most appreciated!

Thank You!

Ami Givol
- Nesher, Israel


 

Cadmium is used for a wide variety of reasons and there is no universal replacement. The best replacement therefore always depends on the circumstance. But if you require compatibility with aluminum, then IVD is the winner.

Ted Mooney, finishing.com Teds signature
Ted Mooney, P.E. RET
finishing.com
Pine Beach, New Jersey


 

Why are you limiting yourself to Zn/Ni or IVD Al. Did you look at Sn/Zn processes. Also with IVD Al you will need to glass bead the surface after treatment to push down the Al coating on the surface to overcome the porosity in the coating. There are reams of information on all the coatings out there plus numerous symposium on the subject of Cd replacements.

George Shahin
George Shahin
Atotech - Rock Hill, South Carolina


 

First I would like to tell you how sorry and shocked I am for the terror attack on the USA. I am sure that the USA will find the way to defend itself and to punish the initiator and the supporters of these inhuman cowardly attacks.

Regarding the Cadmium problem: Maybe I should limit the discussion to aircraft quality fasteners: Now we are using mainly Cd coated alloy-steel screws. We are using them in combination with passivated CRES 303 (18.8) helical coil inserts to fasten Aluminum parts. We consider switching to A286 screws but are afraid of a possible galling problems. Can you recommend a proper coating/finishing for this case?

Sincerely,

Ami Givol
- Nesher, Israel



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