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March 2004

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Subject:
From:
"Morse, Carrie" <[log in to unmask]>
Reply To:
TechNet E-Mail Forum.
Date:
Wed, 3 Mar 2004 15:30:19 -0500
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The best way to ID flux residues is to ask your supplier what they used and on what components.
It sounds like you have flux residue, but, it may be acceptable if it is a No-Clean or RMA, unless you as the customer specify that NoClean is not allowed.  In other words, Flux Residue is not necessarily a bad thing.  

As for your question about gold -- YES -- gold is a "common" plating used on boards.  Tin Lead is common, Tin is common, Copper with OSP is also common.  Gold not only makes nice jewelry, it also a nice conductor of electricity!

-Carrie

-----Original Message-----
From: TechNet [mailto:[log in to unmask]]On Behalf Of Bissonnette,
Jean-Francois
Sent: Wednesday, March 03, 2004 3:19 PM
To: [log in to unmask]
Subject: [TN] Flux Identification and Soldering over gold plated pads???


Got two questions here

First I would like to know if there is a way to identify flux residues on a
soldered assembly.  For instance, I have a series of
board that have a glass like residues between the lead (SMT) and quite a lot
of it.  It looks clear, little bit brownish and it
breaks like glass if I apply pressure with a dentist pick.  Also where hand
soldering was done, the brown color is much 
more obvious.

Second.  Any of you ever seen a board with gold plated lands  instead of tin
plated?  Well I would not be able to say it
it IS gold plated but it sure looks like it and not copper.  

Any help would be appreciated.

Jean-François Bissonnette
Vérificateur, Contrôle de la Qualité
Électronique
Produits et Procédés
Vapor Rail Inc.
10655 Henri-Bourassa O.
St-Laurent, Qc
H4S 1A1

(514) 335-4200 x2021
(514) 335-4231 fax



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