I knew i could not be that blind (no pumpkin home brews here);
Richard , as Eric astutely pointed out your title is Ag,
but in text you talk about gold .

The baking of silver with organic coat obviously very much differs from
gold's;
was it a typo or did you asked for silver ,
(in that case i'd understand your apprehension easier, hangovers too)



thanks           paul



-----Original Message-----
From: Richard Tilbrook [mailto:[log in to unmask]]
Sent: Wednesday, 21 June 2000 17:30
To: [log in to unmask]
Subject: Re: [TN] Ag on Ni - effect of baking


NEW MESSAGE:

Hi folks,
Sorry, I wasn't feeling well yesterday and did not explan myself at all -
the
reason I asked about baking is that we reflowed one side of a surface mount
board
(gold on nickel); we then stored it in a 45'C oven as we were expecting the
remaining parts to arrive for this very urgent job. They unexpectedly took a
week.
They even more unexpectedly didn't want to reflow properly when we tried
reflowing.
I suggested "passivation" as something for the person who brought me the
problem to
think about, though I must confess that being an industrial placement
student, I am
not best equiped to make that kind of judgement. As I try to follow many of
your TN
discussions, and occasionally add when I feel able, I was sure you'd be able
to
give better reasons as to the cause and suggestions for either prevention or
cure.

Thanks and Regards,

Richard Tilbrook



PREVIOUS MESSAGE:

Hi technetters,
I'm hoping to find out a bit more about the effect of baking (at 45 deg. C)
on
boards with gold on nickel.
I would be grateful for any info on the sibject, including times,
temperatures and
effects, such as passivation.

Thanks,

Richard TIlbrook

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