Hi Joe!

Yeah, solder isn't supposed to stick to stainless steel, but sometimes it
will fill the screw heads and stay there. We use Techsprays Wondermask W (the
light blue stuff) as a standard practice on all our hardware that hits the wave.
Stuff washes off fine with no residue in the cleaner.

-Steve Gregory-


> Because connector screws get Loctite, we use stainless steel temporary
> hardware on bottom sides of some of our motherboards, and screw heads and
> washers travel through the solder wave.  With the switch from RMA to OA
> flux (Alpha 3355-HB), we find that solder now adheres to the hardware.
> Here are some of our options:
>
> 1. Use latex temporary solder mask on hardware.  Of course, this will be
> messy and labor-intensive.
>
> 2. Find some 2-56 x 1/2" screws in a material that Sn63 won't stick to.
> Could they make a screw this small in nylon or diallyl pthalate?
>
> 3. Apply some kind of plating or Teflon coat.  Of coarse, with buildup on
> the thread, they may not mate anymore.
>
> 4. What about a spray-on coating?  Would it be worth trying an anti-seize
> like  molybdenum disulfide?
>
> Joe Kane
> BAE SYSTEMS Controls
> Johnson City, NY
>


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