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Antique Tractor Paint and Bodywork

Rusty Aluminum

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Adam Paul

08-27-2004 22:57:38

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Well, OK not rusty but oxidized, pitted, and shabby... Any ideas on how to reverse the years on such an item??? I"ve thought about sandblasting, but wondering if there is a chemical out there that does a real good job...
Thanks in advance,
Adam
PS I"m not the "Adam" that was out bird dogging welding work...

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Kevin (FL)

08-28-2004 05:43:50

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Re: Rusty Aluminum in reply to Adam Paul, 08-27-2004 22:57:38

Adam,

"OSPHO" works pretty good on either steel or aluminum. Its a phosphoric acid solution--use rubber gloves and don't get it in your eyes. Available at local paint or hardware stores--I think it's under $20/gallon. You can brush it on and it kills rust on steel and it kills the oxidation on aluminum. Down south we use it in the marine industry quite a bit. For small parts though, I still sandblast (aluminum) at low pressure (about 40-60 PSI) and then use two-part epoxy paint and it will last a long time.

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Adam Paul

08-28-2004 08:28:45

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Re: Rusty Aluminum in reply to Kevin (FL), 08-28-2004 05:43:50

Thanks for the reply. I should note, Once that aluminum is clean and looking good, it is not going to get painted (a color)... Should I clear coat it then???
AP

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Dozerboss

08-28-2004 11:28:06

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Re: Rusty Aluminum in reply to Adam Paul, 08-28-2004 08:28:45

Yes, Clearcoat is good protection if your not painting it. The aluminum oxidates and that coating remains stable for a long time and protects the base metal like a coating of paint. But like paint nothing lasts forever. People who polish the oxide off on a regular basis are actually removing a small amount of the metal each time as the top layer will oxidize again. Looks like it's an old piece of equipment with dirt contact every time it's used. If dirt was collecting in it and getting wet keeping it in a moist condition, that would speed the eventual pitting.

Now there is an iron used on power poles that is based on the same idea. Rusts to a certain level and remains stable there for a long time. If you have seen poles and fence left to rust--thats why. Cheaper than galvanizing but ugly.

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Big Jim

08-29-2004 20:56:22

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Re: Rusty Aluminum in reply to Dozerboss, 08-28-2004 11:28:06

I think the steel is Cor-Ten steel. They did a lot of our old convention center with the stuff. Once it is fully rusted, it doesn"t look to bad but it takes several years for that to happen and it is a kind of butt-ugly purple while that happens.

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Dozerboss

08-30-2004 12:46:15

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Re: Rusty Aluminum in reply to Big Jim, 08-29-2004 20:56:22

I heard it's used around drill rod on oil drilling op's too. They pump the water/mud through it to cool the bit. Has to be a high strength alloy of steel and some other metals to survive drilling abrasion without breaking and rust out.

There were a couple of discussions about picking up the surplus for maintaince free pipe fence.

Interesting stuff.

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