Chemical Intervention
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Chemical Intervention
Postby Duck! » Fri Aug 30, 2013 2:14 pm
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Re: Chemical Intervention
Postby Nobody » Fri Aug 30, 2013 3:12 pm
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Re: Chemical Intervention
Postby Mulger bill » Fri Aug 30, 2013 3:23 pm
Caustic Soda eats Al and leaves Fe alone. Best introduced via the BB shell IIRC.
Tread very gently, use full PPE and do it outdoors.
Have you tried the cut head of post off-hacksaw blade inside post route?
Reason: Added more emphasis...
London Boy 29/12/2011
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Re: Chemical Intervention
Postby Nobody » Fri Aug 30, 2013 3:26 pm
Good idea. Something I'd consider if it was my own frame, but you'd want to be super careful on a customer's frame.Mulger bill wrote:Have you tried the cut head of post off-hacksaw blade inside post route?
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Re: Chemical Intervention
Postby westab » Fri Aug 30, 2013 4:11 pm
If you don't have access to a "normal" air compressor - a mini compressor used in a car will do - just be careful not to overheat it as some are only rated for a short run time.
Hope this helps.
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Re: Chemical Intervention
Postby ProCelebrityGolf » Fri Aug 30, 2013 11:11 pm
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Re: Chemical Intervention
Postby human909 » Sat Aug 31, 2013 12:39 am
Mercury!Duck! wrote:I'm having a major headache at work with a broken alloy seatpost well & truly stuck in a chro-mo frame. Any clues what kind of chemical treatment would work to dissolve the alloy without harming the chro-mo?
Or
Galium!
http://www.youtube.com/watch?v=8jDFx7ye ... mhq3vRibYA" onclick="window.open(this.href);return false;
- Duck!
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Re: Chemical Intervention
Postby Duck! » Sat Aug 31, 2013 12:42 am
That's been suggested elsewhere as well, and will be followed up next week.Mulger bill wrote:Have not done but have witnessed...
Caustic Soda eats Al and leaves Fe alone. Best introduced via the BB shell IIRC.
Tread very gently, use full PPE and do it outdoors.
Yes. Although there was no need to cut the head off the post, that was why it needed to come out in the first place! (Split tube, detachable head.) That method has been taken as far as it can - the top of the remaining post is about 100mm below the collar, and is about another 150mm long. It's royally stuffed.Have you tried the cut head of post off-hacksaw blade inside post route?
What's the time-lapse of that mercury method? Looks a) slow & b) I'm not all that keen on mercury poisoning thanks.....
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Re: Chemical Intervention
Postby human909 » Sat Aug 31, 2013 9:21 am
But caustic soda is of cause easier to obtain.
These guys seem to do it more safely.
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Re: Chemical Intervention
Postby John Lewis » Sun Sep 01, 2013 4:21 pm
I have read that cloudy ammonia will do the job. Might have been on Sheldon Brown. I can't recall.
Caustic soda will most certainly dissolve the aluminium. Be aware though that the bubbles given off are hydrogen and mixed with air might be an explosion risk. Unlikely I think if outdoors and care taken.
I used to etch Ali face panels with caustic to make a nice surface on homemade electronic equipment so am a bit familiar with it.
john
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Re: Chemical Intervention
Postby Duck! » Fri Sep 06, 2013 2:56 pm
Thanks for all the tips.
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Re: Chemical Intervention
Postby QuangVuong » Fri Sep 06, 2013 5:06 pm
Blog: https://villaveloframes.wordpress.com/
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Re: Chemical Intervention
Postby Mulger bill » Fri Sep 06, 2013 5:34 pm
Duck! wrote:Caustic soda did the trick. Boss took the frame home to do, so I wasn't "in on the act" to witness how it worked. Two goes were required to chew it thin enough, then it was just a matter of carefully levering the remnant with a long, flat screwdriver to peel it away from the frame. Thoroughly rinsed the inside of the frame with vinegar to neutralise any soda residue, and job done.
Thanks for all the tips.
Better to let the boss do it anyway, deniability for you if something gets borked in the process
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