Hi
Could that relate to the Uyemura TWX-40? Supposedly a hybrid bath for plating thicker gold without damaging the nickel?
It doesen't make sense for manufacturers to apply thicker gold electroless when they can use a simpler immersion process, why would anybody do that?
BR
Grunde
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Guy Ramsey
Sent: 12. august 2015 13:02
To: [log in to unmask]
Subject: Re: [TN] immersion silver
Very interesting addition to this discussion.
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Wayne Thayer
Sent: Tuesday, August 11, 2015 5:16 PM
To: [log in to unmask]
Subject: Re: [TN] immersion silver
Hi Joyce-
I thought perhaps someone smarter than me would give a carefully thought out response to your intelligent question, but it seems it was ignored, or went into my auto-junk machine, or maybe I've gone blind.
Anyway, at some point in the 2000's the definition of "Immersion plating"
got changed. I believe this happened because the immersion plating of your definition was extremely easy to use and care for. So people asked for "immersion" and the salesmen started claiming that finishes were "immersion"
when they were actually "electroless" (which are a pain in the rear to apply, manage, and dispose of). I think Uyemura was the first to do this, advertising a thick "immersion gold". I remember going to their booth at IPC that year and trying to figure out what was going on, and when I did my impression was the salesman hid behind the "language barrier".
So "immersion" now means any plating which uses no electrodes, and is put on "kind of" thin through careful process control.
Wayne
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Joyce Koo
Sent: Tuesday, August 11, 2015 12:08 PM
To: [log in to unmask]
Subject: Re: [TN] immersion silver
gurus, I need some education: Immersion process what I know of is surface ionic exchange process, once it covered surface, the chemistry stops, so it is a self limiting process. What is thin and thick? you means it can really gets thicker like electroless type? not self limiting? Many thanks.
Best regards,
jk
> From memory the "thin" and "thick" silver finish classes recognised
> that there were two competing but roughly equally popular IAg
> chemistries in the industry , each with their own process max-min
> deposit thicknesses and one typically thicker than the other.
>
> Clearly it didn't make sense for an IPC spec to have a "barn door"
> range from minimum "thin" to maximum "thick", hence two ranges
> defined. I don't recall one being "better" than the other because of
> the thickness
>
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