Edward,
seems as you and Gaby are neighbours....
Many droplets, we don't know the amount. Remember we have also Copper, Aluminium and Gold in the chain. With 100VDC potential difference, things happen. As someone said, we may also have cracks in the plating etc. You should see the resulting corrosion! Builds up carrier traces, and finally ignition paths. If the connectors had been carefully potted, or had been hermetic, we had not had this problem. For this case, we have gone back to Isopropanol, as I said. We have supposedly drowned connectors in that bath, and nothing negative happened at all.
Regards
Ingemar Hernefjord
Ericsson Microwave Systems
-----Original Message-----
From: Edward Szpruch [mailto:[log in to unmask]]
Sent: den 11 juni 2003 17:48
To: [log in to unmask]
Subject: Re: [TN] Technical question, Vigon cleaning
Ingmar,
I am just trying to figure out what is the capacity of one drop of Vigon in
term of chemical attack on Nickel. I believe you are reffering to one drop ,
which is about 0.01 ml ( 10 drops are considered to be 0.1 ml, at least
this estimation is good enough for titrations ). So, what can do 0.01 ml of
Vigon ??? Dissolve, say 0.1 mg of Nickel???
Edward
Edward Szpruch
Eltek Ltd
P.O.Box 159 ; 49101 Petah Tikva Israel
Tel ++972 3 9395050 , Fax ++972 3 9309581
e-mail [log in to unmask]
> -----Original Message-----
> From: Ingemar Hernefjord (EMW) [SMTP:[log in to unmask]]
> Sent: γ ιεπι 11 2003 16:12
> To: [log in to unmask]
> Subject: Re: [TN] Technical question, Vigon cleaning
>
> Rudy,...accelerated by some chlorides...yep, ..that happens to be our
> latest theory. If so, Vigon is indirectly causing the problem with the
> CONNECTORS (and other hollow components) , we have no problems with board
> cleaning whatsoever.
>
> (My message is not a warning to use Vigon. OUR problem is a special
> circumstance, when droplets of Vigon is closed in and with no way to get
> it out. Stillstanding solutions with pH 11-12 are supposed to be
> dangerous, irrespective of trade name.)
> /Ingemar
>
> -----Original Message-----
> From: Rudy Sedlak [mailto:[log in to unmask]]
> Sent: den 11 juni 2003 15:52
> To: [log in to unmask]
> Subject: Re: [TN] Technical question, Vigon cleaning
>
>
> FYI......
>
> Electroless Nickel plating was invented/created I believe in the 1940's
> (late) to coat the inside of railroad tank cars (!!!!!) to allow them to
> carry caustic soda (sodium hydroxide) solutions. It has become infamous
> for being one of the more passive coatings available.
>
> Unless you have a very vigorous alkali, accelerated by some chlorides, I
> have significant doubt that you are getting attack on "well applied" EN...
>
> Rudy Sedlak ---------------------------------------------------
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