I have an issue with one of the assembly houses we use.  They are using
a No-clean flux that contains adipit and succinic acids (per the MSDS)
in an alcohol base.

Is it allowed to leave flux on the PWB that HAS NOT BEEN DEACTIVATED BY
HIGH TEMPERATURES OF SOLDERING?

I am not talking about the flux used in the solder paste or wave
soldered flus.  I am talking about the flux used at rework and touch-up
of the PWB.

 

I havce seen papers detailing corrosion on PWBs using "no-clean" fluxes
and I have seen it on some of our products.  This usually pccurs near
the periphery of the PWB where the wave solder flux is protected by the
pallet used to pass the PWB through the solder wave.

 

Any opinions and references will be appreciated.  I can give the
manufacturer and flux type to individuals, but don't want to put it in a
global email.

 

Thanks

mark

 

 

mark

Mark Woolley |PTRL Laboratory | Avaya | 1300 West 120th Ave |
Westminster, CO 80234  USA |

Voice (Lab): (303) 538-2166 | email: [log in to unmask] |

 


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