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XXitanium

Conformal coatings

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I'm trying  a "CorrosionX" on my drowned F250 GEM module.

 

Have any of you heard of this stuff?

 

I was told it it used by NASA and the US Navy.

 

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I think Carlos used that on an RC boat that drowned and some electronic thing 'died'.  He sprayed it and it came back.

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A quote from Swampy.

Quote

CorrosionX.  Miracle stuff.  You guys will thank me.  Get it.

  I have marked it to buy some day but haven't done it yet.

Edited by blackhawkxx

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Ok..couple of things in conformal coatings of PCB's.  

1)  You can only keep the PCB as dry as it is when you coat it.  The PCB absorbs moisture and needs to be baked at about 150 - 200 F for min of 3 hrs to really cook the moisture out of the board.  Coating without baking..will trap moisture and can help to cause failure..not prevent it.

 

2)  Anti-static.  Ground the board and yourself when spraying.  You can't use too much, but make sure you layer and coat it like a you would paint a car...but liberal use is just fine.

 

3)  Dry.  Let it really dry.  Another baking is just fine.

 

In my days manufacturing industrial sensors..they used Humiseal quite a bit and that is where I learned the above practices.  Full potting is the best option..but Humiseal is pretty good.

https://m.skygeek.com/humiseal-1a33-humiseal-1a33-aerosol-conformal-coating-11-5-oz-can.html?utm_source=googlebase&utm_medium=shoppingengine&utm_content=humiseal-1a33-humiseal-1a33-aerosol-conformal-coating-11-5-oz-can&utm_campaign=froogle&gclid=Cj0KCQjwyYHaBRDvARIsAHkAXcsKR7F8ignRfRqM2xc_TB7f1J5vcZfvg5kDXX5g1L9Xed1w1IQxeRMaAijfEALw_wcB

 

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...hmmm, I let the board get tacky. I saturated the wireways and slathered them in dielectric grease. My thought was that water would have a hard time getting in if it had to push grease out of the way.

 

It started and we put about 40 miles on it. I think I'll do the windshield / seal - and see if I can get six months more out of it.

 

23 hours ago, TuffguyF4i said:

3)  Dry.  Let it really dry.  Another baking is just fine.

 

This stuff resembles WD-40. It did talk about drying in the instructions though.

 

I suppose I trapped propellents and solvnts in there...

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1 hour ago, blackhawkxx said:

I wonder if it can be used on aluminum to prevent storage corrosion?

 

....I was thinking the same thing....

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