What was the difference of soldering versus dipping?
One does not solder to the gold, it is quickly absorbed into the solder,
and then you form the IMF with the nickel underneath. If they did not
solder with the gold on them, why would they solder with the gold
removed? 

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Lee parker
Sent: Thursday, August 18, 2005 7:54 AM
To: [log in to unmask]
Subject: Re: [TN] HASL over nickel

Richard

There could be many reasons. several years ago I was working with an OEM
who had ENIG boards and on New Years Eve discovered they would not
solder. We removed the gold by dipping the boards into a large solder
pot and then dipped them into a second solder pot to insure a solderable
surface. This removed the gold and left a highly solderable coating of
solder over the nickel. The boards were then assembled (on New Years
Day) which allowed the systems to be shipped on time the day after. 

Best regards

Lee


  ----- Original Message -----
  From: Stadem, Richard<mailto:[log in to unmask]>
  To: [log in to unmask]<mailto:[log in to unmask]>
  Sent: Thursday, August 18, 2005 7:53 AM
  Subject: Re: [TN] HASL over nickel


  Why ever would you want to do this? Why not just solder to the ENIG?
Is
  there some requirement that precludes soldering to the ENIG? 

  -----Original Message-----
  From: TechNet [mailto:[log in to unmask]] On Behalf Of Tom Moore
  Sent: Wednesday, August 17, 2005 2:38 PM
  To: [log in to unmask]<mailto:[log in to unmask]>
  Subject: [TN] HASL over nickel

  Our PC board supplier inadvertently supplied us with boards composed
of
  gold over nickel rather than the specified HASL finish. While we kept
  some of the boards to keep our production line running, we sent the
rest
  back to have the gold stripped off and run through the HASl process.
Now
  our supplier is telling us that they will not be able to remove the
  nickel that has bonded to the copper pads. I'm going to have the
  supplier guarantee the board life in blood, but I would feel more
  confident in having confirmation by this group's expertise. Thanks for
  your help.

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