Sound technical content, curated with aloha by
Ted Mooney, P.E. RET
Pine Beach, NJ

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Coating materials for gas cylinders to prevent marine corrosion

Q. Dear All,

We are looking for candidate coating materials for use in gas cylinders that will prevent marine corrosion.

Thanks in advance for your help.

Luis Díaz
- Mexico
1996

"Standards for Visual Inspection of Steel Compressed Gas Cylinders"
by CGA

on Amazon

(affil links)

A. You probably want some powder coating other than epoxy. You probably need to remove weld scale, blast the cylinders, phosphatize them, and then powder coat them.

Or if you want to job it out, there are several capable shops listed in our Directory of Finishing Shops.

Ted Mooney, P.E.
Striving to live Aloha
finishing.com - Pine Beach, New Jersey
1996

A. US NAVY USES EPOXY POWDER COATINGS INSIDE HIGH PRESSURE AIR FLASKS TO PREVENT CORROSION. THERE IS A MILITARY SPECIFICATION FOR THE COATINGS

STEVE RODGERS
1996

Thanks, Steve.

I understand that epoxy is usually not ideal for outdoor exposure because of UV sensitivity. But now I am confused whether Mr. Diaz is looking for a coating for the exterior (which I had assumed) or the interior (which I guess you are assuming).

Ted Mooney, P.E.
Striving to live Aloha
finishing.com - Pine Beach, New Jersey
1996

1996

A. I don't see any mention of the base material. "Gas cylinders" is an ambiguous term.

A couple of years ago I read in the paper where a man wanted a nice epoxy powder coat finish on his scuffed up scuba tanks. Got a local supplier to do the job. First time he filled the tanks, 4000 psi, kaBOOM. 1 killed, 2 injured. Cure temp of the EPP annealed the Aluminum scuba tanks ...

Although Mr. Diaz did say "in" the cylinder, in this case I would specify a weldable, marine corrosion resistant base material and go easy on coatings.

Harry Andreas

Firstly, thanks to all for your interest in this subject.

I want to say that Ted Mooney assumption is correct. I am looking for a coating for outdoor exposure. And as far as I know, epoxy under these condition will have problems because the UV. In fact the cylinders will work in the gulf of Mexico where are a lot of sun, moisture and salt.

The candidates will be compared in a Salt Fog Cabinet.

Thanks again for your messages,

Sincerely,

Luis DÌaz [returning]
- Mexico
1996

Polyurea

A. Luis,
Why don't you consider use Polyurea? I have read a lot about about it where polyurea has a huge success.

Regards

Alberto Valenzuela M
- Arequipa, Peru
August 17, 2013

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