Joe -
As a long time and now former user of this flux, this is not the only issue
that you may face while using it. It is an extremely aggressive OA flux - I
never came across a stronger OA flux on the market (acid number of 60, 3%
chlorine, pH of 3). It works great even on difficult to solder boards -
old stuff, Cu with OSP finishes, etc. However, it will erode most grades of
stainless steel and will flat out eat up any aluminum. Titanium was the
metal of choice for any fixturing that came in frequent contact with this
flux.
So, look out for eroding metal on your conveyor rails and preheaters. Also,
if you use spray fluxers, you will need to keep an eye on any metal
surfaces and upgrade them or change to nylon or something similar.
Cheryl Tulkoff
Phone:(512) 683-8586
Fax: (512) 683-8847
National Instruments
11500 N. Mopac Expressway
Building A
Austin, TX 78759-3504
"Morse, Carrie"
<CMorse@CIRTRONIC To: [log in to unmask]
S.COM> cc:
Sent by: TechNet Subject: Re: [TN] Solder Sticking To SS Screws
<[log in to unmask]>
01/15/2004 09:26
AM
Please respond to
"TechNet E-Mail
Forum."; Please
respond to
"Morse, Carrie"
Joe,
We use OA flux and do not have a problem with SS screws. Anyone else out
there having a problem with OA flux and SS hardware? (Make sure they are SS
and not Zinc Plated or something else.)
Latex mask is easy to use and we have found a mask that is not messy.
We apply it straight from the bottle or using a dispenser.
Kapton dots can also be used -- those are a bit neater, but, a bit more
expensive.
Nylon screws do exist and we do not have problem with those going thru wave
either.
-Carrie
-----Original Message-----
From: Kane, Joseph E [mailto:[log in to unmask]]
Sent: Thursday, January 15, 2004 10:20 AM
To: [log in to unmask]
Subject: [TN] Solder Sticking To SS Screws
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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