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#4655108 - 02/03/18 05:19 PM Magnesium anode - rust prevention?
davison0976 Offline


Registered: 09/11/14
Posts: 164
Loc: NJ, USA
Was watching this video where at 4:05 they open up a water heater to find it's completely corroded. The root cause, at 4:25 is that "sacrificial" magnesium anode rod was gone.

My question is, has anyone on this forum tried strapping magnesium to a frame or a subframe of their vehicle to prevent corrosion? Was there any effect? Should any effect be expected?

Video:

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#4655139 - 02/03/18 06:06 PM Re: Magnesium anode - rust prevention? [Re: davison0976]
joegreen Offline


Registered: 03/10/13
Posts: 721
Loc: NY
This question gets asked every once in a while. I think the premise is good but you're frame and a hot water heater are in two different environments. The hot water heater is submerged in water where your frame is not. They put those anodes on boat hulls because they are submerged in water. I don't think it really works on a vehicle frame because it's not submerged in water.
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#4655143 - 02/03/18 06:10 PM Re: Magnesium anode - rust prevention? [Re: davison0976]
Ducked Offline


Registered: 10/25/12
Posts: 4030
Loc: Taiwan
Its standard on steel boats, and for metal components on plastic and wooden boats. Also pipeliines. also impressed voltage, where the object to be protected has electrons pushed into it.

Isn't supposed to work on cars because the environment isnt sufficiently conductive, but I havnt tried it.

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#4655302 - 02/03/18 08:52 PM Re: Magnesium anode - rust prevention? [Re: davison0976]
Kestas Offline



Registered: 06/04/02
Posts: 12216
Loc: The Motor City
It won't work because the sacrificial anode only protects to a finite distance. One or a handful of anode won't be enough to protect a vehicle from rusting away. If it did work, you'd see nearly every car up north fitted with anodes, and places like Krown would be out of business.

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#4655330 - 02/03/18 09:34 PM Re: Magnesium anode - rust prevention? [Re: Kestas]
Ducked Offline


Registered: 10/25/12
Posts: 4030
Loc: Taiwan
Originally Posted By: Kestas
It won't work because the sacrificial anode only protects to a finite distance. One or a handful of anode won't be enough to protect a vehicle from rusting away. If it did work, you'd see nearly every car up north fitted with anodes, and places like Krown would be out of business.


In a sense galvanized steel is just a distributed sacrificial anode, which gets around the distance problem.

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#4655338 - 02/03/18 09:37 PM Re: Magnesium anode - rust prevention? [Re: davison0976]
tom slick Offline


Registered: 05/26/03
Posts: 9291
Loc: Central Coast, Calif.
As long as you keep your vehicle constantly wet itíll work great.
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#4655420 - 02/03/18 11:39 PM Re: Magnesium anode - rust prevention? [Re: davison0976]
BrocLuno Offline


Registered: 09/06/15
Posts: 5205
Loc: Kalifornia Kollective
Body off and galvanize the frame. Works every time laugh
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