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Fire extinguisher tank

Post questions and info about pneumatic (compressed gas) powered cannons here. This includes discussion about valves, pipe types, compressors, alternate gas setups, and anything else relevant.
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Unread postAuthor: SpudBlaster15 » Thu Jul 22, 2010 1:27 pm

Ah, for some reason I had assumed the tank was unprotected steel. If it is indeed aluminum, it shouldn't need an inner coating of paint, as aluminum is quite corrosion resistant thanks to the passive oxide layer that forms on its surface.

Ragnarok wrote:The oxide coating that forms on aluminium is protective.

Basically the top few molecules oxidise (very fast, given aluminium's reactivity), but then that top layer prevents oxygen getting to the lower layers.

True, however continuous exposure to liquid water, especially an aqueous solution containing small amounts of dissolved NaCl (As would be present here, with Gunfreak living near the ocean), will eventually cause the protective layer to break down and allow corrosion to proceed further into the metal. Aluminum is often anodized to form a thicker oxide coating that will be more resistant to harsh environments.

I wouldn't worry about it though. In this application, the tank should last many years before any significant corrosion occurs.
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Unread postAuthor: Gun Freak » Thu Jul 22, 2010 1:34 pm

Ok thank you guys so much for the help and the info, I will probably be long done with this tank in a few years so I'm good. Cheers :occasion5:
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