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Old 10-26-2014, 08:53 AM   #21
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It isn't often used, but the actual name is sacrificial anode. The whole reason for the anode is to protect the tank from corrosion. Magnesium is less noble than steel and will give itself up, corrode to protect the steel.
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Old 10-26-2014, 09:09 AM   #22
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It isn't often used, but the actual name is sacrificial anode. The whole reason for the anode is to protect the tank from corrosion. Magnesium is less noble than steel and will give itself up, corrode to protect the steel.
I though that (Electrolysis) came into play here also? Youroo!!
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Old 10-26-2014, 09:30 AM   #23
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I though that (Electrolysis) came into play here also? Youroo!!
Electrolysis is what causes the corrosion. You protect the metal structure, in this case a water heater, via cathodic protection which can be either a sacrificial anode or an impressed current system. Anodes give up themselves and must be periodically replaced. Sacrificial anodes are used on some buried structures, but more often current is impressed onto the buried structure, say a pipeline, to keep current from flowing off of the pipe. Where the current flows off, steel is slowly removed and a pit, corrosion, is formed.
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Old 10-26-2014, 09:55 AM   #24
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You can always just run some steel wool over it before you reinstall it, but that doesn't do much down in the pits. KWIM
I'd be hesitant using steel wool. It will leave behind metal filings that will rust. Something like a ScotchBrite pad would be better since it is not corrosive.
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Old 10-26-2014, 10:20 AM   #25
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Ok so this is still ok and not in need of replacing?
It is OK and normal.
Your good for a few more season if it doesn't wear off any quicker.
Just need to do a good HWT flush to clear all the sediments from the bottom.
Just run the water with the anode remove and insert a small brush, or a long piece of wire inside to help clean everything out.
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Old 10-26-2014, 02:36 PM   #26
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All good info to know. I feel like I have just gone back to high school science class.
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Old 10-27-2014, 09:52 AM   #27
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Electrolysis is what causes the corrosion. You protect the metal structure, in this case a water heater, via cathodic protection which can be either a sacrificial anode or an impressed current system. Anodes give up themselves and must be periodically replaced. Sacrificial anodes are used on some buried structures, but more often current is impressed onto the buried structure, say a pipeline, to keep current from flowing off of the pipe. Where the current flows off, steel is slowly removed and a pit, corrosion, is formed.
Is it really (Corrosion or Erosion)? The Arod (Erosion) slows/stops the (Corrosion) of the Water tank? Youroo!!
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Old 10-27-2014, 10:11 AM   #28
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It's not recommended to leave the anode rod out during the winter because both the tank and the threads are steel and can rust which could make it difficult to seat in the Spring. (I've never witnessed this, though, but I've never taken mine out except to drain the water and I do wrap well with teflon tape whenever the old stuff is looking worn....usually once a year.)
I think my anode rod became a Christian this summer...he's looking awful holy now! ;-)
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Old 10-27-2014, 06:31 PM   #29
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After thinking about it, since the fiver is going back to the factory I actually decided the safest place for it was back in the tank. Thanks again for the responses.
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