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Old 09-15-2018, 11:16 AM   #1
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Metal on metal rust

I know a little about galvanic something(not enough to know the name). Where the exhaust hangers are strapped around exhaust is where my exhaust is rusting/rusted through. Is the purpose to keep you paying $200+ to fix it every 5 yrs or so?
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Old 09-15-2018, 04:25 PM   #2
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Galvanic corrosion happens with dissimilar metals, not steel on steel. Heat and vibration is probably what got that connection.
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Old 09-15-2018, 05:30 PM   #3
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So, how can it be stopped? Im considering wrapping the pipe in that fiberglass cloth and then putting the hanger over it..im guessing its going to be a $400 fix to replace the pipe from the first hanger back.
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Old 09-15-2018, 08:45 PM   #4
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In addition to heat and vibration there's always a little gap between the pipe and a strap-style hanger. Dust, water, and road salt get in there and accelerate the corrosion. It's hard to guess whether fiberglass wrap or other spacer between the pipe and the strap would help.

Weld-on hangers eliminate those problems above, but the welding burns off the coating (whether aluminized or galvanized) and then it's at risk of rusting again. Is that a net win over a strap-style connection? Maybe.. at least it lacks the gap that holds debris and lacks the vibration which turns a little dirt into a grinder.

I put an exhaust system on my pickup truck a few years ago which had an interesting solution: hanger hooks welded to u-bolt style clamps. The u-bolt style clamp won't vibrate the way a strap-style hanger can and welding the hanger there also avoids burning the coating off the exhaust tube.

Depending on how advanced the corrosion is on your exhaust, u-bolt clamps might not be an option. If the tube is weakened too much these would be liable to crush or even tear through your tubing.
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Old 09-16-2018, 04:54 AM   #5
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Quote:
Originally Posted by family wagon View Post
In addition to heat and vibration there's always a little gap between the pipe and a strap-style hanger. Dust, water, and road salt get in there and accelerate the corrosion. It's hard to guess whether fiberglass wrap or other spacer between the pipe and the strap would help.

Weld-on hangers eliminate those problems above, but the welding burns off the coating (whether aluminized or galvanized) and then it's at risk of rusting again. Is that a net win over a strap-style connection? Maybe.. at least it lacks the gap that holds debris and lacks the vibration which turns a little dirt into a grinder.

I put an exhaust system on my pickup truck a few years ago which had an interesting solution: hanger hooks welded to u-bolt style clamps. The u-bolt style clamp won't vibrate the way a strap-style hanger can and welding the hanger there also avoids burning the coating off the exhaust tube.

Depending on how advanced the corrosion is on your exhaust, u-bolt clamps might not be an option. If the tube is weakened too much these would be liable to crush or even tear through your tubing.
I'll get some pics of it..its weird that the only rust on the pipe is where the hangers are, maybe an inch on both sides. Everywhere else looks almost new..when i replace the pipe the hangers need replaced too.
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Old 09-16-2018, 09:38 AM   #6
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One word...stainless.
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Old 09-16-2018, 02:11 PM   #7
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One word...stainless.
Assuming i can get stainless hangers. Isnt the pipe already stainless?
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Old 09-16-2018, 07:20 PM   #8
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Assuming i can get stainless hangers. Isnt the pipe already stainless?
Its usually aluminized steel.
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Old 09-16-2018, 10:28 PM   #9
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Don't know of ant buses that come from the factory with stainless exhaust systems.


Gotta DIY it.
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Old 09-17-2018, 05:03 PM   #10
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Don't know of ant buses that come from the factory with stainless exhaust systems.


Gotta DIY it.
This exhaust is not the original..my bus is an 87.
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