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bhilden
Trad climber
Mountain View, CA/Boulder, CO
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Topic Author's Original Post - Aug 28, 2015 - 08:59am PT
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There was an interesting discussion over on Mountain Project about painting SS hagers. Jim Titt(JimT on Supertopo) maintains that painting SS hangers facilitates corrosion:
"Stainless steel gains itīs corrosion resistance by producing chromium oxide which is passive and prevents further surface corrosion by blocking oxygen diffusion to the steel surface, this blocks corrosion from spreading into the metal's internal structure. Passivation occurs only if the proportion of chromium is high enough and oxygen is present, a coating which prevents oxygen reaching the surface prevents passivation from happening. The usual problem is that the coating either becomes damaged (by tightening the bolt or by karabiners) or porous due to ageing and allows water to penetrate which becomes anaerobic.
We passivate all our products during manufacture and any attempt to apply a surface coating using methods such as abrading or etch priming is removing the passive layer.
Itīs not exactly a new phenomenon that requires any study as it has been extensively researched in industry for many decades."
The thread is here:
http://www.mountainproject.com/v/painting-hangers/107166179__1
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k-man
Gym climber
SCruz
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Aug 28, 2015 - 10:24am PT
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Locker, that is hilarious!
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Mungeclimber
Trad climber
Nothing creative to say
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Aug 28, 2015 - 10:51am PT
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Practical impact as reduction for what amount of time relative to length of SS hanger?
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bhilden
Trad climber
Mountain View, CA/Boulder, CO
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Topic Author's Reply - Aug 28, 2015 - 11:03am PT
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So are you guys implying that we just shouldn't care? How about moving forward? Then why use SS at all?
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jeff constine
Trad climber
Ao Namao
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Aug 28, 2015 - 11:06am PT
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ZZZZZ!
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