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JonnyFresh
Jul 23, 2013, 10:58 PM
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Hi so im wondering if anyone has tried using Neverwet to protect Carbon/Zinc plated power-bolts against corrosion? This product is new and looks pretty revolutionary. Anyways what i would like to do is use Stainless Steel hangers and carbon powerbolts that have been coated with Neverwet to protect against corrosion.
FAQ
Why stainless hangers? Because if i coated the carbon hangers over time the coating would wear off while clipping.
Why not use stainless bolts? They are expensive and im just curious if this would work.
Don't you know you should never mix stainless with carbon bolts? Yes but if this did work wouldn't it last just as long and be stronger?
(This post was edited by JonnyFresh on Jul 23, 2013, 10:59 PM)
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acorneau
Jul 23, 2013, 11:34 PM
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JonnyFresh wrote: Hi so im wondering if anyone has tried using Neverwet to protect Carbon/Zinc plated power-bolts against corrosion? This product is new and looks pretty revolutionary. Anyways what i would like to do is use Stainless Steel hangers and carbon powerbolts that have been coated with Neverwet to protect against corrosion. FAQ Why stainless hangers? Because if i coated the carbon hangers over time the coating would wear off while clipping. Why not use stainless bolts? They are expensive and im just curious if this would work. Don't you know you should never mix stainless with carbon bolts? Yes but if this did work wouldn't it last just as long and be stronger?
There's a big difference between metal "getting wet" and the electro-mechanical process known as galvanic corrosion.
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dugl33
Jul 24, 2013, 12:34 AM
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Stick with the plated hangers if you are going to use plated bolts. The bolt itself isn't as easily inspected but the most apt to suffer from corrosion. No need to make this worse by mixing metals and hoping a coating will be effective barrier against the effects of galvanic corrosion. (You'd be better off painting your hangers to match the rock or leave them plain, IMO.)
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kennoyce
Jul 24, 2013, 2:45 PM
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JonnyFresh wrote: Don't you know you should never mix stainless with carbon bolts? Yes but if this did work wouldn't it last just as long and be stronger?
The problem with mixing metals isn't just that the bolt will corode faster than the hanger, the problem is that the stainless steel hanger will actually CAUSE the bolt to corode regardless of if either are wet or not. So as has been said, use plated hangers with plated bolts even if you coat them.
As far as the neverwet is concerned, You're going to scrape a lot of it off the bolt as you hammer it into the hole, so it will just start corroding at the places where the neverwet coating has scraped off first and probably won't slow down corrosion at all.
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majid_sabet
Jul 24, 2013, 4:30 PM
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another BS product for newbee climbers
use SS, its easy to inspect, cheap to replace and no need to worry about rust building up under another carbon coating.
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JonnyFresh
Jul 25, 2013, 7:23 AM
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Thanks for the feedback fellas, after doing a little more research i have come to the same conclusion myself.
-Cheers
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USnavy
Jul 25, 2013, 5:13 PM
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kennoyce wrote: JonnyFresh wrote: Don't you know you should never mix stainless with carbon bolts? Yes but if this did work wouldn't it last just as long and be stronger?
"Galvanic corrosion is an electrochemical process in which one metal corrodes preferentially to another when both metals are in electrical contact and immersed in an electrolyte."
http://en.wikipedia.org/wiki/Galvanic_corrosion
In any case, ghetto rigging is ghetto rigging no matter how you split it. Dont use some crap protectent, just buy the right material!
(This post was edited by USnavy on Jul 25, 2013, 5:14 PM)
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Skuce
Jul 25, 2013, 11:53 PM
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Galvanic corrosion can happen as long as there is humidity in the air. It doesn't have to be "wet" to start electron swapping.
So pretty much the only 2 places it doesn't happen is Death Valley and Antarctica 
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USnavy
Jul 26, 2013, 9:20 AM
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JimTitt
Jul 26, 2013, 10:38 AM
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Sure, humidity also provides the electrolyte usually when it forms a thin layer of condensation. The rule of thumb is at over 80% rel. humidity but this may vary.
There´s plenty of mind-numbing research on galvanic activity out there but the main difference for the rate of corrosion is probably the conductivity of the electrolyte not the metal mix. Here´s a good start:- http://www.ewp.rpi.edu/hartford/~turnem4/EP/Other/Primary%20Resources/galvanic%20corrosion.pdf
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billcoe_
Jul 31, 2013, 10:07 PM
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I've seen where a Stainless wedge anchor held up real well long term with a shit steel (homeade) hanger. Hangers tend to look like shit, but the wedge anchor looks like new after many many years even when buried under 4 inches of moss and kept wet for most of the year.
I wouldn't reverse that order though and expect similar results (ie, steel wedge anchor and SS hanger).
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