From a soldering point of view I have a preference for immersion silver.
More generally I understand some people whose products are to be used in
adverse situations contend that any real metal plate offers better
protection to copper against possible corrosion than any organic material.
This is on the tracks as well as unsoldered pads. [And this includes
conformal coat boards and so on.]
Suggest you hope a coating guy is reading this, they are better qualified to
comment on protection offered by resin systems than me.
Regards
Mike Fenner
Indium Corporation
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-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Kevin Glidden
Sent: Friday, October 20, 2006 1:59 PM
To: [log in to unmask]
Subject: Re: [TN] Gold immersion vs. silver immersion
Not necessarily...only if the solder wets to the entire pad, which may not
be so if using lead free...
Kevin
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Ian Hanna
Sent: Friday, October 20, 2006 8:46 AM
To: [log in to unmask]
Subject: Re: [TN] Gold immersion vs. silver immersion
Assuming you're not assembling at sea -- the finish will have disappeared
into your solder joint long before your ship sails.
Question is do you prefer a copper/solder or a nickel/solder bond. Ian
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Charlie McMahon
Sent: Friday, October 20, 2006 7:28 AM
To: [log in to unmask]
Subject: Re: [TN] Gold immersion vs. silver immersion
Good Morning All:
Might I ask for some guidance from you all..
In determining a surface coating a conflict has arisen between choosing Gold
immersion vs. Silver immersion as the
choice. The application is for boards that are used in shipboard electronics
(non military) but they are protected from the external environment.
My question is which is the more appropriate coating?
Technically, the gold has always worked from the PCB fab and assembly end
with success with a controlled cost of ownership.
The silver however is one that causes concern.
Any suggestions would be appreciated.
Best Regards,
Charlie McMahon
McMahon Sales Company
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