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Old 05-11-2012, 03:43 PM   #1
Buzzard217
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Default coating compressor tank?

Would it be worth while to coat the inside of a compressor tank like you would a gas tank? Just thinking preventative maintenance before rust has a chance to eat a hole in whatever new to me compressor I get.
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Old 05-11-2012, 04:19 PM   #2
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Default Re: coating compressor tank?

Cheaper and less problematic to install an automatic moisture ejector. I do know the NHRA Safety Safari trucks use a common air tank and coat it with a bed liner like industrial coating on the inside and fill it with water and ColdFire (a VERY corrosive extinguishing agent) and it lasts about 3-4 seasons. They were getting 1 on bare steel.
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Old 05-11-2012, 04:24 PM   #3
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Default Re: coating compressor tank?

Weird. If they're filling it with liquid, I would expect that they would use an anode rod, and it should last a really long time.

With an air filled tank, that's another story. If there is a pinhole, or even a scratch in the coating that lets moisture get through, it will leave a pocket that can corrode faster underneath the coating, than if were no coating at all.
This doesn't sound like a good idea to me, with the exception of something like a zinc coating, but that has its own down sides.
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Old 05-11-2012, 04:37 PM   #4
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Default Re: coating compressor tank?

Always wondered if you could coat the inside with something like the old GE Glyptol paint. Don't know if even that is still available.
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Old 05-11-2012, 06:25 PM   #5
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Default Re: coating compressor tank?

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Originally Posted by rlitman View Post
Weird. If they're filling it with liquid, I would expect that they would use an anode rod, and it should last a really long time...
Anode rod work for galvanic corrosion, but would be meaningless against many other types of corrosive agents.

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Always wondered if you could coat the inside with something like the old GE Glyptol paint. Don't know if even that is still available.
Yes, Gliptol is still available... Very expensive, much more than the cost of an automatic drain!
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Old 05-12-2012, 12:44 AM   #6
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Default Re: coating compressor tank?

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Anode rod work for galvanic corrosion, but would be meaningless against many other types of corrosive agents.
Please explain this. Corrosion is an oxidiation process. It is a redox reaction, and that is a galvanic process which an anode will help with.
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Old 05-12-2012, 07:05 AM   #7
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Default Re: coating compressor tank?

Anode rods are sacrificial, where you have a 'battery' caused by dissimilar metals. A strong corrosive agent would just dissolve the anode rod in a few minutes (perhaps with other unintended consequences!)
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Old 05-12-2012, 11:08 PM   #8
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Default Re: coating compressor tank?

Quote:
Originally Posted by Buzzard217 View Post
Would it be worth while to coat the inside of a compressor tank like you would a gas tank? Just thinking preventative maintenance before rust has a chance to eat a hole in whatever new to me compressor I get.
Coating the tank will certainly help prevent corrosion, but it is tricky for a DIYer to get a good coat on the inside of a tank once the tank is welded together. As someone else pointed out you are better off with an auto drain valve.
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