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solder paste selection for an oxidized pin?

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#56896

solder paste selection for an oxidized pin? | 10 October, 2008

what is the best solder paste type(RA,RMA,R,WS,...) for removing oxidation from the pins of our parts.

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#56917

solder paste selection for an oxidized pin? | 14 October, 2008

no answer?

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JAX

#56919

solder paste selection for an oxidized pin? | 14 October, 2008

Pump up the Halides.

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#56930

solder paste selection for an oxidized pin? | 15 October, 2008

Similar to Jax's comment, concern yourself with the the activity level of the flux. A more active flux would be more aggressive in removing tarnish. Certainly, the choice depends on the type and amount of tarnish. Probably, you need to consider your ability to clean the parts, because many aggressive fluxes are corrosive.

As an alternative, consider using a preconditioner tailored for the metal of the leads of your parts. Metals joiners use these solutions to remove the tarnish prior to soldering.

Talk to your paste suppliers for advice on the specifics of your situation.

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#56975

solder paste selection for an oxidized pin? | 17 October, 2008

One of our quality engineers established a procedure to use Tarn-X to clean terminals prior to soldering.

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#57050

solder paste selection for an oxidized pin? | 22 October, 2008

A no-clean paste with an above average amount of halides should do the trick. Kester EP256HA is a good choice for this application if you are using a leaded alloy (Sn63 or Sn62).

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#57051

solder paste selection for an oxidized pin? | 22 October, 2008

Wire wheel works too. Pre tin the part. Hand solder after reflow.

Or order good parts.

I prefer the last one. Hows that for an answer?

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#57052

solder paste selection for an oxidized pin? | 22 October, 2008

unacceptable statement! Infidel!

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#57054

solder paste selection for an oxidized pin? | 22 October, 2008

Not a statement - it's a fact .

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