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Printed Circuit Board Assembly & PCB Design Forum

SMT electronics assembly manufacturing forum.


Blue color in solder bath and tinned lead

steve

#33131

Blue color in solder bath and tinned lead | 10 March, 2005

OK all you Gurus here's one for ya. Customer is tinning wires with standard eutectic solder in a solder pot. There is a blue tint to the solder in the pot. After tinning with OA flux, which I will change to NC shortly, he has clear teflon insulation and can see a blueish tint under theinsulation. Any suggestions on why or what? Can't wait to hear from you.

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#33138

Blue color in solder bath and tinned lead | 10 March, 2005

This phenomenon is caused by a high amount of halogens (Cl, Br etc.) used in the flux activators or in the flux surfactants. We've seen effects creating all colors of the rainbow. Changing to No-Clean (halide-free) will eliminate this color effect.

Hope this helps

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RDR

#33140

Blue color in solder bath and tinned lead | 10 March, 2005

Patrick told you why, But here is some more info for ya, I would absolutely not recommend that wires be tinned with OA. The residue will never get cleaned underneath the insulation and all of your strands will strt to break in the near/far future.

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steve

#33146

Blue color in solder bath and tinned lead | 10 March, 2005

Thank you both for your assistance. I knew that I could count on you folks. The customer has purchased No-Clean flux and is using it as we speak. Hows that for customer service.... All in a days work... Thanks again You make me look good!!! Steve

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