Hi Steve - I have one data point I can share! I know of a leadfree wave
solder process which is using the Sn96/Ag4 solder alloy in a standard
solder pot (I'll find out the specific configuration today) which has been
operational for 3 years. The solder pot has shown no signs of degradation
due to the Sn96 alloy. There are a number of different coatings and lining
materials (e.g. titanium, ceramic coatings, vapor deposited barriers) which
can be used to render a wave solder pot non-reactive to a high tin content
solder  - but we'll pay a bit more for the solder pots in the future!

Dave Hillman
Rockwell Collins
[log in to unmask]




"Stephen R. Gregory" <[log in to unmask]>@IPC.ORG> on 09/19/2001 10:08:46 PM

Please respond to "TechNet E-Mail Forum." <[log in to unmask]>

Sent by:  TechNet <[log in to unmask]>


To:   [log in to unmask]
cc:

Subject:  [TN] Wave soldering with high Tin content solders...


Hi all,

God bless America.

This question comes from the ongoing push to lead-free soldering. It is
accepted that temperatures will be higher, and that solders will have a
higher Tin content than in the past...

I have heard (from people that I trust) that the higher temperatures, and
higher tin content in lead free solders, are going to play hell with wave
solder pots. High Tin content solders at higher temperatures, tend to "eat
through" stainless steel, and may even require replacement of wave solder
pots on a yearly basis...yikes!!!

Have any of you heard of this?

I've also heard (through the grape-vine) that there is somebody out there
that has developed some sort of coating or treatment that is done to the
pots, that will extend pot-life with higher temperature, lead free, high
tin content solder pots...is this true?

-Steve Gregory-

---------------------------------------------------------------------------------
Technet Mail List provided as a free service by IPC using LISTSERV 1.8d
To unsubscribe, send a message to [log in to unmask] with following text in
the BODY (NOT the subject field): SIGNOFF Technet
To temporarily halt delivery of Technet send the following message: SET Technet NOMAIL
Search previous postings at: www.ipc.org > On-Line Resources & Databases > E-mail Archives
Please visit IPC web site (http://www.ipc.org/html/forum.htm) for additional
information, or contact Keach Sasamori at [log in to unmask] or 847-509-9700 ext.5315
---------------------------------------------------------------------------------