We are seeing PCBs returned from our customer which have a black substance
around solder joints and within the solder resist window.

It does not appear to be flux but our customer has suggested that it could
be a fungus.  The boards are shipped to China so are seeing high humidity
etc.

Has anyone ever seen anything like this and what is the solution?

We are using Multicore MF300 flux (water soluble) and are not cleaning the
boards after assembly.

Thanks,

Neil

Neil Atkinson - Quality Manager
Stadium Electronic Controls Division
Stephen House, Brenda Road, Hartlepool TS25 2BQ




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