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Reply To: | TechNet E-Mail Forum. |
Date: | Tue, 2 Oct 2001 09:36:16 +0100 |
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Hi Neil,
I personally would not use a water soluble flux and not clean it
afterwards,
no matter where the boards end up (high humidity or not).
To leave this type of flux on the board especially in a high humidity
climate is asking for trouble. What you are probably seeing is tin/lead
corrosion?
Regards,
Roger Deakin
PEC Producibilty Engineer
Address abcd
Newport Road
Cowes
Isle of Wight
PO31 8PF
& Tel +44 (0) 1983 202629
& G-Net 7 605 2629
% Fax +44 (0) 1983 202106
) EMAIL [log in to unmask]
> 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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