Thanks, Lee. That means a lot coming from a man of your stature in the industry. Its the old story of beleiving those outside the house than those inside. 
Bev

----- Original Message -----
From: TechNet <[log in to unmask]>
To: [log in to unmask] <[log in to unmask]>
Sent: Wed May 06 20:16:35 2009
Subject: Re: [TN] Nickel - again

Bev

I have never tried lead free solders with nickel, but my experience with tin lead was a disaster. Years ago a "noted soldering expert" suggest that nickel coated features on PCBs would be all the rage.  Fortunately we found early on in some lab experiments it passivates  in half a heart beat. Some others were less fortunate.

Best regards
Lee
J. L. Parker Ph. D.
JLP Consultants LLC
804 779 3389
  ----- Original Message ----- 
  From: Bev Christian<mailto:[log in to unmask]> 
  To: [log in to unmask]<mailto:[log in to unmask]> 
  Sent: Wednesday, May 06, 2009 7:41 PM
  Subject: [TN] Nickel - again


  Technetters,
  Have any of you had any experience with trying to solder tin-based solders
  to uncoated nickel?  What kind of flux did you use?  Do you know if the
  joints had long term reliability, not just appearing to be "strong" joints
  right after formation?  What about negative wetting angles causing possible
  stress concentration points?
  Bev
  RIM

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