What is this stuff on this rim?

ccaissie · Jul 20, 2016

Repairing a corroded rim during a flat repair. Had leaking tube with calcium.

Cleaning around the valve stem hole, I thought I was getting into some sort of black iron oxide, but it looks more like it was some sort of filler. Seems metallic. About as hard as the steel. The stuff surrounds the hole except for that bright patch to the right where I got down to steel.

Now what?

Destroked 450 · Jul 20, 2016

It's a real heavy build up of rust, grind it all off and paint the bare steel, I've been able to get some to break off using a ball peen hammer.

markct · Jul 20, 2016

That would be oxidation that ran out of air thus the black color

showcrop · Jul 20, 2016

2X what MarkCT said

ccaissie · Jul 21, 2016

OK, thanks. Have never seen exactly that. Almost looked like a repair/fairing putty, like on yachts and other exotic items...Fords, etc.

William Fissell · Jul 28, 2016

I've been exactly where you are, and what he said- oxidation.

Royse · Jul 28, 2016

Judging from its location, around the edges, not needing repair,
I would agree it is probably rust/oxidation.
Were it putty used as repair in a location that needed it, I might
think it was the fast setting (6 minute) JB Weld. It is black.

gears · Jul 29, 2016

I used a hammer and chisel to clean all that scale off the last rim I did. Loud & Messy but faster than grinding.

ccaissie · Jul 30, 2016

Got it done, down to base metal, primed, remounted tube and tire.

Now all i have to do is figure out the calcium question.

Please let's not do the calcium discussion here....it's been hashed out elsewhere.

Thanks, C

What is this stuff on this rim?

ccaissie

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Destroked 450

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markct

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showcrop

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ccaissie

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William Fissell

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Royse

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gears

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ccaissie

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