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topic 5870

Plating Silver on Hafnium

(2000)

Hi All:

We have a customer asking us to plate a 95.5% hafnium/.5%zirconium pin with silver.

We have tried several methods, including copper strike and palladium seed/electroless nickel, to put an undercoat prior to silver plate. In all cases, adhesion has been extremely poor.

Does anyone have any experience with this material, or have a guess as to a method to achieve good adhesion? Thanks in advance.

Chris Ford
N. Andover, Massachusetts


Hafnium in Nuclear Engineering
from Abe Books

or

(2000)

There are patents covering methods for plating onto these alloys, a reference is Modern Electroplating, Lowenheim, John Wiley & Sons, 1974, p.618-635.

The method I read is too complicated to answer here, involving heat treating, fluorides, ultrasonics, etc. A problem seems to me the difference in the thermal coefficient of expansion of the two alloys and the plating.

pooky tom pullizi signature
Tom Pullizzi
Falls Township, Pennsylvania

(2002)

ATTN: CHRIS FORD We notice on this website that in 2000 you were looking for a solution to silver plate hafnium. We have the same problem and are trying to either silver or nickel plate hafnium prior to brazing. Did you find a solution? If so, can you share it with us? Await your reply.

Best regards,

COLIN HUMPHRIES
- POTTERS BAR, HERTS, ENGLAND



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