I've been using gold over silver succesfully for prototype boards.
The main reason I started this is because I need/want to avoid Ni
on my RF boards. I used to use just silver but had problems with
silver sulphide buildup after people had handled the boards. The Au
provides a good protection for the Ag.

Au over Ag may be unique to my fabricator (and may well have been
developed in direct response to my needs), but I don't know that
there's anything particularly difficult involved - I certainly don't
get charged any extra.

John Haddy

-----Original Message-----
From: Wayne Bickers [mailto:[EMAIL PROTECTED]]
Sent: Tuesday, 23 April 2002 11:50 AM
To: Protel EDA Forum
Subject: [PEDA] Gold or silver plating


Sorry this is a little off topic but you guys are the ones who will know.

I have 3 issues, 

1) I require a smooth finish, hence gold or silver plating/ flashing
2) I need the PCB's to last in stores for a period of time, for arguements
sake call it 1 year without oxidising 
3) I need to have some pads hand soldered and require a good wetting effect
(spreading of the solder when applied)

I would appreciate it if anyone out there has tried both and could indicate
which may be the better finishing material to use.


thanks 

Wayne Bickers
Electronics Engineer
Tru-Test Ltd

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