Richard

As the gold is somewhat porous, I'd guess that the underlying Ni has oxidised during 1
week at 45 deg C (why????).

Brian

Richard Tilbrook wrote:

> 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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