Steve
Check your Sn:Pb ratio now, you may have lost quite a bit of tin if you
have been over-drossing!
BTW, the old Hollis oil-in-wave was bloody marvellous for reducing
drossing by 90% :-) I used the old Lonco Fusecote 240 with W/S flux and
removed the "oil" (it wasn't an oil at all) and dross sludge from the
machine about once a week. Compared with the oil valve on so that you
could see a slight "measling" of the wave with oil microdroplets and the
oil valve closed, the dross formation was reduced by at least 100 g/day,
and the solder joints were more brilliant, to boot. The Fusecote washed
off with the flux (Lonco 3355-ST) but it could cause foaming problems if
there were an excess. Those were the days, my friend (that could make a
good line for a song :-) )
Brian
Steve Gregory wrote:
> Mornin' all,
>
> I've got a problem here that's giving me a little headache. As you may
> know, we got a new wave solder machine not too long ago, an Electrovert
> Electra.
>
> For the past couple of weeks we've had a problem with dross particles
> sticking to the soldermask. It's happening across all our boards,
> whether or not we use an OA flux or RMA. Go to:
> http://www.stevezeva.homestead.com and look at Dross Particles, and More
> Dross.
>
> As you can see, it's not that bad, but it's irritating. The particles
> don't want to come off without mechanically brushing the board either,
> and again it doesn't matter if it's OA flux or RMA. If we run them
> through our cleaners without brushing the boards, the particles will
> remain.
>
> Our pot is clean, it's de-drossed every morning. We're using Kester
> 2331ZX OA, and Alpha 16-125 RMA. It's being applied by a OptiFlux
> ultrasonic spray fluxer.
>
> The boards look great coming out of wave except for these random bits of
> dross sticking to the mask. Solder joints look great, no dross in them
> at all...just sticking to the mask.
>
> Got me kind of puzzled...anybody ever have this happen to them?
>
> Thanks!
>
> -Steve Gregory-
>
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