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Old 09-10-16, 06:57 AM
  #26  
Moe Zhoost
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Originally Posted by AnkleWork
Unless your bike is immersed in an electrolyte, the anode will only protect the holes you drilled to mount it.

And, FYI, water drains easily through a small meniscus leaving only a small drop (about the same amount retained by the lip of a larger hole).
Absolutely right. I recall, in the 80's a device that set up a reverse galvanic potential to protect car bodies. The science was correct except only for the fact that without an electrolytic solution it does nothing.

You're wasting your time.
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Old 09-10-16, 07:01 AM
  #27  
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Originally Posted by texaspandj
I agree about your camera prowess. However I'm anxious to see a pic of the bike.


It is evolving. I don't want to start another moment in the forum with my 'pastie' crown race.
Coming from 72.5 to 70.5 degrees in Head Tube Angle (relative to the ground) appears to make quite a difference in trail. Now I just need to find the fork that is long enough to do the same as my proof in concept setup. I could have bent the rake offset back, but my weight and metal fatigue isn't the best match.
I got one more project after I've settled on the fork, but it is more attuned to bikes that already have cranks forward.
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Old 09-10-16, 07:27 AM
  #28  
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Old 09-10-16, 08:06 AM
  #29  
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Originally Posted by Moe Zhoost
Absolutely right. I recall, in the 80's a device that set up a reverse galvanic potential to protect car bodies. The science was correct except only for the fact that without an electrolytic solution it does nothing.

You're wasting your time.


In case you missed it.
https://www.bikeforums.net/19045766-post24.html


Also a meniscus doesn't take into account paint flakes, grease and all kinds of nature happening.


By the way, they are back in business.
https://www.theautosaversystem.com/index_en.php
Now all those rusting hulks can thank the government for the delay of this technology.
Thankfully Aspirin is grandfathered in or the government would be going after that.

Last edited by ArmChairRider; 09-10-16 at 08:11 AM.
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Old 09-10-16, 05:35 PM
  #30  
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No electrolyte, no free transfer of electrons between the steel and the sacrificial anode, and no significant protection. Your plan is goofy but I reckon it won't affect your ride.

Good luck.
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Old 09-11-16, 09:50 PM
  #31  
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America's leading HVAC specialists are using sacrificial donor metals on their heat pumps and air conditioners up and down the south east coast to South Carolina's coast.
Carrier
American Air And Heat
Gemaire
Numerous other HVAC locals in the coastal areas.
More at this link (https://www.bikeforums.net/19045766-post24.html)

Last edited by ArmChairRider; 09-11-16 at 10:45 PM.
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Old 09-11-16, 10:18 PM
  #32  
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If you're letting your bike get wet and stay wet (like an air conditioner or a boat hull) then you have bigger problems* than cathodic protection can solve.
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Old 09-12-16, 12:07 AM
  #33  
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The condenser coils are dry with the exception of rain and condensation while not operating. Any outside condensation on the condenser coils is quickly dried up when the air conditioner starts to operate.
https://en.wikipedia.org/wiki/Air_co...#Split_systems
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Old 09-12-16, 06:58 AM
  #34  
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Isn't this to protect a copper/aluminum heat exchanger on a stationary A/C system? I am not sure the logic applies to protect a moving steel bike. I guess we will know when we see all of the pros riding next year with an 8 oz. block of magnesium hanging from their bottom brackets...

I think a dab of zinc paint on the exposed steel hole would have been more than sufficient.

When the bike is moving and bumping along I suspect that the water bubble of a smaller hole would easily have been broken and released, and I fear the larger hole may be more of an invitation for water to splash in to the hole and gunk up your bottom bracket bearings. I do not think the larger hole is enough to compromise any strength however.
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Old 09-12-16, 08:25 AM
  #35  
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The sacrificial donor metal I have weighs 2.4 ounces.
It isn't covering up the bottom bracket drain hole, it is behind my kickstand.
All that matters is if there is a voltage potential.
Boats move.
Air conditioners in humid salty air are stationary.
Yet both benefit from a sacrificial donor metal.
"... I fear the larger hole may be more of an invitation for water to splash in to the hole and gunk up your bottom bracket bearings."
Possibly so.
Has anyone offered what the dimension of the hole at the bottom bracket should be?
And can they tell us how they reached their conclusion?

Last edited by ArmChairRider; 09-12-16 at 09:20 AM.
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Old 09-12-16, 11:44 AM
  #36  
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I'm glad that you know more about cathodic protection than everybody that actually designs those systems. I'm sure you'll be very happy.
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Old 09-14-16, 03:22 PM
  #37  
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It kept his friend's aluminum Cannondale frame from rusting.
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Old 09-14-16, 03:25 PM
  #38  
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Originally Posted by ArmChairRider
It is a sacrificial piece of metal.
Martyr Anodes CM873395M Volvo Penta DPS S Anode, Magnesium
by Martyr Anodes
Link: https://amzn.com/B007D292ZC


It will corrode setting up a voltage that will protect steel and aluminum from corrosion.
Normally used on boats but this one is specifically used in freshwater.
So any mild corrosion of this magnesium will set up a voltage potential between the two metals.
Paint works too...
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Old 09-14-16, 03:35 PM
  #39  
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Psst. Stainless steel for high humidity salt air environments.

Reynolds 921, 931, and 953; Columbus XCr; KVA MS3
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Old 09-14-16, 04:02 PM
  #40  
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Originally Posted by Scooper
Psst. Stainless steel for high humidity salt air environments.

Reynolds 921, 931, and 953; Columbus XCr; KVA MS3
Or better yet Titanium. The bike will outlive you.
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Old 09-14-16, 04:05 PM
  #41  
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So,... Picture of the bike?
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Old 09-14-16, 04:09 PM
  #42  
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Originally Posted by Grand Bois
It kept his friend's aluminum Cannondale frame from rusting.
That must absolutely be true. =)
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Old 09-15-16, 10:56 AM
  #43  
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Originally Posted by Grand Bois
It kept his friend's aluminum Cannondale frame from rusting.
Aluminum frames are sacrificial anodes.
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Old 09-15-16, 02:11 PM
  #44  
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All of my sailboats have had zinc sacrificial anodes and hull mounted ground plates for radio and standing rigging grounding.
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Last edited by Scooper; 09-15-16 at 02:14 PM.
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