TECHNET Archives

May 2012

TechNet@IPC.ORG

Options: Use Monospaced Font
Show Text Part by Default
Show All Mail Headers

Message: [<< First] [< Prev] [Next >] [Last >>]
Topic: [<< First] [< Prev] [Next >] [Last >>]
Author: [<< First] [< Prev] [Next >] [Last >>]

Print Reply
Subject:
From:
Mike Fenner <[log in to unmask]>
Reply To:
Date:
Wed, 30 May 2012 10:01:17 +0100
Content-Type:
text/plain
Parts/Attachments:
text/plain (93 lines)
Yes it was! This whole exchange caused me to do a little (very little)
Googling  for a quick refresh. 
So far as I found, in electronics a NiP layer is used in some otherwise pure
Ni electrolytic plating intended for wire bonding, this to reduce Kirkendall
voiding on wire bonds, but not soldering.



Regards


Mike 


 

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Per-Erik Tegehall
Sent: Wednesday, May 30, 2012 8:32 AM
To: [log in to unmask]
Subject: Re: [TN] Phosphorus at the BGA pad

That was very interesting information. You write that it is used for a
number of other electronic applications. Do you know if it ever has been
used as finish on surfaces to be soldered?

Per-Erik


-----Ursprungligt meddelande-----
Från: TechNet [mailto:[log in to unmask]] För Martin Bayes
Skickat: den 30 maj 2012 08:55
Till: [log in to unmask]
Ämne: Re: [TN] Phosphorus at the BGA pad

As others have already posted, conventional electrolytic nickel gold used as
a PWB final finish,  uses a pure nickel underlayer.

It is worth noting that, for a number of other electronic component
applications, electrolytic nickel-phosphorus is used commercially, rather
than pure electrolytic nickel, due to its higher corrosion resistance.

Such electrolytic nickel-phosphorus baths, typically operated at low bath pH
(below 2) and contain hypophosphorous acid.  Co-deposition occurs in an
analogous manner to electroless systems (with P-content controlled by
variables including bath pH, hypophosphous acid content and current
density).

The development of modern day electroless nickel systems was triggered by
the serendipitous discovery of electrolytic nickel phosphorus systems by
Brenner and Riddell at what was then the National Bureau of Standards (now
NIST) in the 1940's ( A. Brenner and G. Riddell, J. Res. N. B. S., (37), 32
(1946).

Martin

______________________________________________________________________
This email has been scanned by the Symantec Email Security.cloud service.
For more information please visit http://www.symanteccloud.com
______________________________________________________________________

*** Attention ***
This electronic mail including attachments is intended only for the
person(s) or entity to which it is addressed and may contain confidential
and/or legally privileged material and information. Unauthorized disclosure,
copying, distribution or use of this material and information may be
unlawful and is prohibited. If you are not the intended recipient and have
received this mail in error, please contact the sender and delete all
contents of the e-mail as well as any copies made.
Thank you!

*** Attention ***
This electronic mail including attachments is intended only for the
person(s) or entity to which it is addressed and may contain confidential
and/or legally privileged material and information. Unauthorized disclosure,
copying, distribution or use of this material and information may be
unlawful and is prohibited. If you are not the intended recipient and have
received this mail in error, please contact the sender and delete all
contents of the e-mail as well as any copies made.
Thank you!

______________________________________________________________________
This email has been scanned by the Symantec Email Security.cloud service.
For more information please contact helpdesk at x2960 or [log in to unmask] 
______________________________________________________________________



______________________________________________________________________
This email has been scanned by the Symantec Email Security.cloud service.
For more information please contact helpdesk at x2960 or [log in to unmask] 
______________________________________________________________________

ATOM RSS1 RSS2