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More on lead-free ...

A

Arfa Daily

Jan 1, 1970
0
Hi all

Following on from earlier discussions regarding the replacement of
traditional solder with lead-free alternatives, here is a link to the latest
piece on the subject of lead-free electronics, which I received from one of
my suppliers a few days back. The last paragraph is particularly
interesting.

Arfa
 
Hi all

Following on from earlier discussions regarding the replacement of
traditional solder with lead-free alternatives, here is a link to the latest
piece on the subject of lead-free electronics, which I received from one of
my suppliers a few days back. The last paragraph is particularly
interesting.

Arfa

link?


NT
 
E

Eeyore

Jan 1, 1970
0
Arfa said:
Hi all

Following on from earlier discussions regarding the replacement of
traditional solder with lead-free alternatives, here is a link to the latest
piece on the subject of lead-free electronics, which I received from one of
my suppliers a few days back. The last paragraph is particularly
interesting.

Do go on !

Graham
 
N

N Cook

Jan 1, 1970
0
Eeyore said:
Do go on !

Graham

Its a modern form of lemon juice invisible ink. He used the electrons from a
lemon+Zn+Cu.
 
A

Arfa Daily

Jan 1, 1970
0
Eeyore said:
You hadn't previously heard of tin whiskers ? It's why Swatch asked for a
total exemption from the ban on lead in solder.

Graham
Yes, of course I had heard of tin whiskers. I just thought that it was
interesting to see the latest mutterings about the subject, gathered
together in one place, and with particular reference to the surface plating
of the leadouts on electronic components. I dare say that many others
reading on here have not heard of them, so again, another reason to post the
link ...

I also felt that the findings that lead had a beneficial effect in
preventing the growth of these, was particularly relevant, now that it has
been largely banned from solder, except in the cases of equipment which is
responsible for human safety, such as avionics, medical instrumentation, and
to a debateable degree, military.

Arfa
 
C

Chris Jones

Jan 1, 1970
0
N said:
http://uk.farnell.com/jsp/bespoke/bespoke7.jsp?ATT=whiskers_text&CMP=NLC-Fin
dings&bespokepage=farnell/en/ed_world/news/latest_news/2006/tin_whiskers.jsp

similarly
Does anyone know the reason for silver migration around the edges of
ceramic resonators or the thin element of ceramic filters?. Going ohmic
across the faces so operational failure.


I seem to remember reading something about that in "Physical Design of
Electronic Systems" (which comes in about 6 volumes, by published by Bell
Telephone).

I think that the silver migration is affected by the presence of DC voltages
and maybe humidity etc., whereas nobody knows how to accelerate tin whisker
growth, (so we'll have to wait X years before we find out that everything
produced in the last X years is going to fail.....)

Chris
 
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