No, it was not Bev. One of ,my colleagues from Vermont.
Douglas Pauls | Technical Fellow | Electronics AMT
COLLINS AEROSPACE
400 Collins Road NE, MS 108-101, Cedar Rapids, IA 52498 USA
Tel: +1 319 295 2109 | Mobile: +1 319 431 3773
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Subject: [External] Re: [TN] Salt
Well, thank you, Bev!
Now I know who asked this question in the first place, LOL!
Odin
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Subject: RE: [TN] Salt
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And that, Odin, is a great answer to Doug's question.
Bev
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Sent: December 15, 2022 9:44 AM
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Subject: Re: [TN] Salt
I have not, but I do know that as the salt dries on the floors/rugs, it becomes airborne easily. It is known to rust the satellite heaters in building entryways, as well as corrode damper hardware in exhaust stacks nearby. Interestingly, it is not a problem in Norway because they are not allowed to put regular salt on the roadways. But it does not stop people from using water conditioner salt on their own property.
In thinking about it, for the client factories that I work in, no product is exposed while in storage. All parts are in some type of container, bag, box, or stacked trays in sealed ESD bags, etc. All CCSAs are in ESD molded trays with snap-in covers. The only time parts and boards are exposed is during build processes. If not being processed, they are in some type of protective Faraday tray, cage, bag, or container.
So for the small amount of time they are actually exposed to factory air, and because we wash prior to assembly and several times during assembly, I doubt that any contamination level would ever reach the point that it would affect soldering or bonding. But I do not know if we have any data that says otherwise.
Thinking about the fabricated PWBs alone in the factories I work in, the PWBs are not removed from the vendor packaging until they are about to be built. They are removed from the vendor bags, split out to fill the job order which go directly into the bake oven, the remainder re-sealed immediately per IPC-1601, and after baking they go into the drybox until ready to be processed.
Of course airborne salt could possibly get on them during baking but even all of the ovens have incoming air filters. There is no incoming air while stored in the dryboxes. It just so happens our PWB drying ovens are all in the middle of the factories, but I don't think it was planned that way to prevent airborne contaminants from getting on them. The configuration of the ventilation system would play a role in that, but I have never analyzed that.
And I have no idea if this is an issue or could be an issue at our board fabricator's facilities.
It's a really good question!
Odin
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From: TechNet <[log in to unmask]> On Behalf Of Pauls, Doug O Collins
Sent: Thursday, December 15, 2022 6:56 AM
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Subject: [TN] Salt
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Good morning Technetters,
I have an odd question to pose which came from a colleague of mine. It is now the snow and ice season across much of the northern states. Our facilities people tend to put down a pretty heavy layer of salt on the walkways leading up to the building, which can then be tracked into the building. Has anyone ever done a study on whether tracking salt into a facility correlates with an uptick in ionic failures? I know I have not.
Douglas Pauls | Technical Fellow | Electronics AMT COLLINS AEROSPACE
400 Collins Road NE, MS 108-101, Cedar Rapids, IA 52498 USA
Tel: +1 319 295 2109 | Mobile: +1 319 431 3773
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