I agree with Karen the if the wires drew up the flux they will fail. You
will need to remove some wires and have Ion Chromatography testing done, but to
clean them you may want to use a saponifier followed with DI water steam to
get both the flux and saponifier out from the wire.
Terry Munson
Foresite
_www.residues.com_ (http://www.residues.com)
765-457-8095
In a message dated 3/10/2009 8:43:07 A.M. Eastern Daylight Time,
[log in to unmask] writes:
Yuck!
The flux wicked up the wires, those wires will fail. If the wires can be
replaced, you may be able to salvage the rest of the boards if you wash
them very thoroughly with hot DI water. A prewash with saponifier wouldn't
hurt. After washing, you will need to ensure that all the flux was
removed by ionic cleaniless measurements or extraction and IC.
Good luck
Karen Tellefsen - Electrical Testing
[log in to unmask]
Jim West
<[log in to unmask]
M> To
Sent by: TechNet [log in to unmask]
<[log in to unmask]> cc
Subject
03/09/2009 06:46 [TN] Wrong flux used
PM
Please respond to
TechNet E-Mail
Forum
<[log in to unmask]>
; Please respond
to
Jim West
<[log in to unmask]
M>
During selective soldering, our operator used an IA flux (superior flux
75), which we normally use to dress up the soldering nozzle to create a
smooth flow of solder. The flux was applied by a spray fluxer. The
operator used the wrong bottle when reloading the spray fluxer.
We ran the boards through a wash system hoping to remove the IA flux.
The soldering operation involves discrete wires and I would think that the
flux would wick up under the wire insulation and not be reachable for
cleaning.
My questions are:
If the flux has wicked up under the wire insulator and can not be reached
by cleaning, will this type of flux
cause issues with the copper wire?
Will cleaning the boards be enough to say that no harm will be done, or
will this flux cause latent issues due to it's aggressiveness? (other
components were touched by this flux, i.e. SMT ceramic capacitors,
resistors)
Flux information
Superior soft soldering flux:
"The inorganic acid (IA) zinc chloride fluxes, commonly referred to as
"acid fluxes," are used for industrial soft soldering applications with
tin/lead, tin/silver, and other solder combinations. These fluxes typically
contain a combination of zinc chloride, hydrochloric acid, and ammonium
chloride and are used for soldering stainless steels, brass, copper, and
other metals."
Thanks,
Jim
---------------------------------------------------
Technet Mail List provided as a service by IPC using LISTSERV 15.0
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 or (re-start) delivery of Technet send e-mail to
[log in to unmask]: SET Technet NOMAIL or (MAIL)
To receive ONE mailing per day of all the posts: send e-mail to
[log in to unmask]: SET Technet Digest
Search the archives of previous posts at: http://listserv.ipc.org/archives
Please visit IPC web site http://www.ipc.org/contentpage.asp?Pageid=4.3.16
for additional information, or contact Keach Sasamori at [log in to unmask] or
847-615-7100 ext.2815
-----------------------------------------------------
---------------------------------------------------
Technet Mail List provided as a service by IPC using LISTSERV 15.0
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 or (re-start) delivery of Technet send e-mail to
[log in to unmask]: SET Technet NOMAIL or (MAIL)
To receive ONE mailing per day of all the posts: send e-mail to
[log in to unmask]: SET Technet Digest
Search the archives of previous posts at: http://listserv.ipc.org/archives
Please visit IPC web site http://www.ipc.org/contentpage.asp?Pageid=4.3.16
for additional information, or contact Keach Sasamori at [log in to unmask] or
847-615-7100 ext.2815
-----------------------------------------------------
**************A Good Credit Score is 700 or Above. See yours in just 2 easy
steps!
(http://pr.atwola.com/promoclk/100126575x1219671244x1201345076/aol?redir=http:%2F%2Fwww.freecreditreport.com%2Fpm%2Fdefault.aspx%3Fsc%3D668072%26hmpgID
%3D62%26bcd%3DfebemailfooterNO62)
---------------------------------------------------
Technet Mail List provided as a service by IPC using LISTSERV 15.0
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 or (re-start) delivery of Technet send e-mail to [log in to unmask]: SET Technet NOMAIL or (MAIL)
To receive ONE mailing per day of all the posts: send e-mail to [log in to unmask]: SET Technet Digest
Search the archives of previous posts at: http://listserv.ipc.org/archives
Please visit IPC web site http://www.ipc.org/contentpage.asp?Pageid=4.3.16 for additional information, or contact Keach Sasamori at [log in to unmask] or 847-615-7100 ext.2815
-----------------------------------------------------
|
