Paul,

Lockheed Martin use a lot of platings. I'm not sure, but I have seen
Boron as a barrier somewhere, just can't find it right now. Anyway,
Lockheed as well as NASA use many special platings. Non-magnetic, guess
you have a RF application that need low-loss lines.

http://supplier.external.lmco.com/supplier/po_information/specpro2.htm


I was myself looking for a non-magnetic finish once, and if I remember
right, there is a difference between EN and EN. The acidous electroless
nickel is not ferromagnetic, while alcaline electroless nickel is
somewhat ferromagnetic.

Borohydride electroless Nickel-Boron is probably non-magnetic too.

However, you should contact your plating chemist to verify, it was many
years since I mixed with this. (In earlier days, we had our own
chemists, many of them had piles of knowhow, but then came the
economist's era, and the chemists were kicked out)

Inge

 

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Stolar, Paul W
Sent: den 12 juni 2007 23:38
To: [log in to unmask]
Subject: [TN] Plating

We are using nickel as a barrier metal on a PC board for the pads. 

Are there any other barrier metals we can use which are non-magnetic.

Bare copper is not an option.

Paul Stolar
Materials/Reliability Engineer
Manufacturing Reliability Lead Engineer
Baker Atlas
713-625-5376
713-625-4949 (fax)

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