Hi Siggi,
We are manufacturers of PCB and I could say, that such questions are being
asked for years for all kinds of finishes including Pb/Sn , OSP , Tin etc.
Such atmosfere as you describe will harm all unsoldered areas ( Pb/Sn , OSP
, Tin , Silver etc ) and probably make them non-solderable. Metal sulfides
are known as species of extremally low solubility.
But soldered joints - they will look nasty, but nothing more, since the
affected sulfide layer is on the surface only and not coming deep into
joint.
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: Zweigart, Siegmund [SMTP:[log in to unmask]]
> Sent: Tue September 14 2004 14:12
> To:   [log in to unmask]
> Subject:      [LF] Lead free soldered products in S- containing atmosphere
>
> Hello all
>
> I got an interesting question:
> What will happen in the lead free world with products which have to be
> tested in S- containing atmosphere in regard to corrosion?
> Pb is known to prevent corrosive effects, but now we will have Ag in
> solder
> joints which reacts quite easy with S.
> Did anybody know of any studies in regard to that topic?
>
>
> Best regards
>
> Siggi
>
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