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April 1999

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Subject:
From:
"Severson, Scott M." <[log in to unmask]>
Reply To:
TechNet E-Mail Forum.
Date:
Mon, 12 Apr 1999 09:02:26 -0500
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Hi All,
 
We have a BNC connector that is put through reflow and wave solder with
water washes after each soldering operation.  The customer has been
returning some product because the BNC connectors are turning black in
the field.  
 
Cross-sectional and SEM/EDS analysis show that the connector has a
ferrous base-metal with copper overplate.  Nickel is plated on top that
contains about 5%phosphorous.  The "bad" connectors have a Ni thickness
of 0.1mil and the "good" connector has Ni thickness of 0.2mil.  A trace
of copper was detected on the "bad" connectors (about 1%).   
 
What could be causing the black oxide?  Could it be copper oxide from
solid state diffusion of the copper through the nickel barrier?  Other
ideas?
 
Some of the units were in the field for 6 months to a year.
 
Thanks
Scott
 
************************************************************************
*****************************
Scott M. Severson                      
QA/FA Lab Manager                                            "Space and
Time
                                                              are not
conditions in which we live, 
Benchmark Electronics Inc.                         but modes in which we
think."     
4155 Theurer Blvd.                       
Winona, MN
55987                                                          
---Albert Einstein               
(507)452-8932                                                           
                               
************************************************************************
*****************************
 
 

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