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March 2006

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Tue, 21 Mar 2006 12:00:42 -0600
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TechNet E-Mail Forum <[log in to unmask]>, Genny Gibbard <[log in to unmask]>
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Would brass fall under exemption #6 from the directive annex?
Lead as an alloying element in steel containing up to 0,35 % lead by
weight, aluminium containing up to 0,4 % lead by weight and as a copper
alloy containing up to 4 % lead by weight.

Which may mean the brass can contain Pb and still be "compliant", but
solder used for soldering to it cannot.  That might explain the need for
Pbfree solder - to maintain RoHS compliance.
However, I'm not a metallurgist, so ...

Genny.

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of David D. Hillman
Sent: March 21, 2006 11:12 AM
To: [log in to unmask]
Subject: Re: [TN] PB-Free Solder and Brass

Hi Mark! One additional comment to add to Mike's information. Brass is
an alloy of copper and zinc.  One potential problem when soldering to a
brass alloy is the zinc content causing long term solder joint integrity
issues.
De-zincification is where the zinc preferentially diffuses into the
solder joint potentially causing solder joint failures. The way to avoid
this phenomena is to plate the brass with a barrier layer such as copper
or nickel. You might check to see if the contacts have a barrier layer.
Good Luck.

Dave Hillman
Rockwell Collins
[log in to unmask]




             "Barmuta, Mike"
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             KE.COM>
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             03/21/2006 09:51          Re: [TN] PB-Free Solder and Brass
             AM


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              "Barmuta, Mike"
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Hi Mark: First of all it doesn't make sense why the customer wants to
use a leadfree solder on a leaded (C360 brass)  component. It won't be
RoHS compliant. What is there reason for asking for leadfree solder?

However if ours is not to question why then give them what they are
asking for; leadfree solder.

You may have oxidized parts and need a stronger flux/deoxidizer. As a
test try dipping a few in 5% sulfuric acid for 20-30 seconds at room
temp, rinse well with cold water and dry immediately.
See if they wet better. If they do then use the acid predip or a
stronger fluxing agent. If they don't you could always tin plate them
along with a copper or nickel barrier plate and solder to the tin.



Regards

Michael Barmuta

Staff Engineer

Fluke Corp.

Everett WA

425-446-6076

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Mark Clark
Sent: Tuesday, March 21, 2006 6:52 AM
To: [log in to unmask]
Subject: [TN] PB-Free Solder and Brass

I have a customer that is required to use a Lead Free solder to attach
some brass components (battery contacts) to a PCB.  What he is
experiencing is the brass will not tin using this solder.  Anyone have
any suggestions:



Solder required for use:

Cookson Electronics - Alpha Cleanline 7000

Alloy 96.5Sn 3.0Ag 0.5Cu

Flux: P2



The contact material is:

360Brass



His customer is in a rush for these components, and is demanding the
Pb-free be used.



BTW - the good old fashion No-clean and Rosin (both of these have lead
in
them) work great.



TIA

Mark Clark

Avalon Engineering, LLC

2179 Fourth Street, Suite 2D

PO Box 10789

White Bear Lake, MN 55110-0789

Phone: 651-426-8599 x202

Fax: 651-426-4418

mailto:[log in to unmask]

www.avalon-us.com

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