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Can someone explain?

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Can someone explain?

Old 04-11-19, 01:05 PM
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jlafitte 
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Can someone explain?

Am I going crazy or is this salt coming out of my fork??




This is a Columbus Zona frameset made to order by Colossi, shipped direct to the local shop where it was built up. I noticed this stuff leaking out of the vent holes last couple times I washed the bike. I've put around 3000 km on it. Never been ridden anywhere but south Louisiana, where there is no real winter and the roads are never salted.
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Old 04-11-19, 01:33 PM
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Flux?
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Old 04-11-19, 01:39 PM
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I agree, looks like flux. You might want to get some hot water inside the fork and allow it to soak for an hour or so and then flush it out with more water. Flux is acidic and will eat up the paint.
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Old 04-11-19, 03:15 PM
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Almost looks like dried linseed oil.
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Old 04-11-19, 05:46 PM
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Originally Posted by David Tollefson View Post
Almost looks like dried linseed oil.
and if so it was squirted inside to prevent rust and the excess is now draining out. I heard from a builder that used to make frames in a production environment that they had problems with forks breaking from water used to rinse out the inside that eventually created rust but never had a problem with flux left after brazing.
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Old 04-12-19, 04:20 AM
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What does excess frame saver look like?
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Old 04-12-19, 06:45 AM
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IME this discharge is old flux. I've seen this a number of times on frames that have never seen a Frame Saver red hose. My assumption is that water has seeped into the vent hole and carried out some flux when the water tried to exit. Andy.
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Old 04-12-19, 07:14 AM
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one way to tell if it's flux, heat it up and see if it turns to liquid. Not on the fork, of course. It's a bit weird that it's migrating though. And I would think that anything put in there as a frame saver would stay put as well. Flux would migrate if it got wet I suppose, but I'm not sure I see why it would be (essentially) symmetric around the hole.

I don't know how paint reacts to flux, but my experience is that it's okay on steel.
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Old 04-12-19, 08:51 AM
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The issue with residual flux, IMO, is that it absorbs moisture out of the air. Just look at a joint that's sat after brazing w/ flux. Over time the flux will change, it softens and changes from the glassy nature it has after brazing.

It's my feeling that residual flux can speed up any rusting that might otherwise happen, so I like to remove it as best possible or seal it in so no additional moisture can reach it. Andy
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Old 04-13-19, 08:09 AM
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I've posted this before but it bears repeating...

On one of my early frame builds I cleaned the flux off by mechanical means on the outside and didn't do anything on the inside. Painted it up and rode the heck out of it for a good year or so until noticing corrosion on the bottom bracket around where the seat tube inserted into the shell. Looked closer and found some other corrosion in similar locations on the frame. Concluded that flux was migrating through porosity/pin holes in the brazing filler. Not good. Since then I'm a bit manic about removing flux.
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Old 04-16-19, 06:44 PM
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Thanks for the answers and discussion, folks. For a minute there I was perturbed and and entertaining bizarre conspiracy theories. The stuff looks exactly like the salt that collects under a hanging wetsuit!
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Old 04-16-19, 10:38 PM
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most fluxes have borax as an ingredient, which is a salt.
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