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Date: | Tue, 3 Sep 2013 06:09:05 -0500 |
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This does not involve ENIG as it a large flat aluminum sheet metal with a layer of nickel..
Victor,
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of David D. Hillman
Sent: Thursday, August 29, 2013 6:19 PM
To: [log in to unmask]
Subject: Re: [TN] Solder joint failure
Hi TechNet - the gold plating of an ENIG surface finish is primarily protecting the underlying nickel from oxidation so that an active flux is not required to produce a solder joint. During soldering the gold diffuses into the solder allowing a tin/nickel intermetallic phase to form creating the basis for a metallurgical joint. If the nickel gets oxidized, then a highly active flux is typically needed to allow the same reaction to occur.
Dave Hillman
Rockwell Collins
[log in to unmask]
From: Robert Kondner <[log in to unmask]>
To: <[log in to unmask]>
Date: 08/29/2013 03:03 PM
Subject: Re: [TN] Solder joint failure
Sent by: TechNet <[log in to unmask]>
I agree. The flux makes a big difference.
I regularly solder to nickel tabs that are spot welded to battery cells.
I
played with various flux materials, the thick RMA flux from flux pens has worked best. I have also solder coated by dipping in a solder pot, that RMA works well.
This always concerned me about ENIG, once the gold is dissolved off the surface what happens next?
Bob K.
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Glidden, Kevin
Sent: Thursday, August 29, 2013 3:01 PM
To: [log in to unmask]
Subject: Re: [TN] Solder joint failure
In my experience nickel is NOT easy to solder to at all.
-----Original Message-----
From: Victor Hernandez [mailto:[log in to unmask]]
Sent: Thursday, August 29, 2013 2:53 PM
To: [log in to unmask]
Subject: [TN] Solder joint failure
Fellow TechNetters:
Should I be concern with an electroless matted nickel plating over an aluminum sheet metal surface and solder onto a copper heat tube? I
recall something about directly soldering onto a nickel surface. Beside nickel oxidation. Any suggestions would be greatly appreciated.
Victor,
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