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"
<Mike.Barmuta@FLU
KE.COM>
To
Sent by: TechNet [log in to unmask]
<[log in to unmask]>
cc
Subject
03/21/2006 09:51 Re: [TN] PB-Free Solder and Brass
AM
Please respond to
TechNet E-Mail
Forum
<[log in to unmask]>
; Please respond
to
"Barmuta, Mike"
<Mike.Barmuta@FLU
KE.COM>
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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