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Magnesium anode - rust prevention? #4655108
02/03/18 05:19 PM
02/03/18 05:19 PM
Joined: Sep 2014
Posts: 164
NJ, USA
davison0976 Offline OP
davison0976  Offline OP
Joined: Sep 2014
Posts: 164
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:

Re: Magnesium anode - rust prevention? [Re: davison0976] #4655139
02/03/18 06:06 PM
02/03/18 06:06 PM
Joined: Mar 2013
Posts: 904
NY
joegreen Offline
joegreen  Offline
Joined: Mar 2013
Posts: 904
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.


1978 Chevrolet k20
Engine: Delo 10w30xle
Transmission: Castrol transmax dex/merc

1984 Mercedes-Benz 300 turbo diesel
Engine: Delo 400 15w40le
Re: Magnesium anode - rust prevention? [Re: davison0976] #4655143
02/03/18 06:10 PM
02/03/18 06:10 PM
Joined: Oct 2012
Posts: 4,825
Taiwan
Ducked Offline
Ducked  Offline
Joined: Oct 2012
Posts: 4,825
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.

Re: Magnesium anode - rust prevention? [Re: davison0976] #4655302
02/03/18 08:52 PM
02/03/18 08:52 PM
Joined: Jun 2002
Posts: 12,647
The Motor City
Kestas Offline
Kestas  Offline
Joined: Jun 2002
Posts: 12,647
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.

Re: Magnesium anode - rust prevention? [Re: Kestas] #4655330
02/03/18 09:34 PM
02/03/18 09:34 PM
Joined: Oct 2012
Posts: 4,825
Taiwan
Ducked Offline
Ducked  Offline
Joined: Oct 2012
Posts: 4,825
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.

Re: Magnesium anode - rust prevention? [Re: davison0976] #4655338
02/03/18 09:37 PM
02/03/18 09:37 PM
Joined: May 2003
Posts: 9,362
Central Coast, Calif.
tom slick Offline
tom slick  Offline
Joined: May 2003
Posts: 9,362
Central Coast, Calif.
As long as you keep your vehicle constantly wet itíll work great.


You get what you pay for...
So keep in mind how much you paid for this advice.
Re: Magnesium anode - rust prevention? [Re: davison0976] #4655420
02/03/18 11:39 PM
02/03/18 11:39 PM
Joined: Sep 2015
Posts: 6,080
Kalifornia Kollective
BrocLuno Offline
BrocLuno  Offline
Joined: Sep 2015
Posts: 6,080
Kalifornia Kollective
Body off and galvanize the frame. Works every time laugh


Formerly in marine engineering. In an earlier life I owned my own petroleum tank truck, and hauled for the majors and independent's.

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