protection from corrosion

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KasseemF

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What are standard methods used for NEC 314.23(G requirement for protection against corrosion for enclosures encased in concrete. I live on an island where almost every building is concrete and we have serious issues with corrosion due to the salt in the air from the ocean.

Do most enclosure come with corrosive protection? or are their products that have to be used on enclosures to improve their corrosive protection? If their are products please name some of them.
 
KasseemF said:
What are standard methods used for NEC 314.23(G requirement for protection against corrosion for enclosures encased in concrete. I live on an island where almost every building is concrete and we have serious issues with corrosion due to the salt in the air from the ocean.

Do most enclosure come with corrosive protection? or are their products that have to be used on enclosures to improve their corrosive protection? If their are products please name some of them.
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Non-metallic enclosures, such as PVC, fiberglass refinforced resin or stainless steel. Marine grade aluminum may also hold up in sea-salt, but I don't know if the additional lime in the concrete screws that up.
 
Aluminum won't last long in concrete, due to the high (alkaline) pH. Ditto for zinc fittings.

Ironically, cast iron (FS or FD) boxes serve rather well. The iron seems to rust on the surface only, and not flake apart as steel would do. Just be sure to coat your screw threads with anti-seize or Noalox, or everything will rust together.
 
Need two metals? Bull Puckey.

Ever see crystal Drano work? All it is made of is flakes of pure aluminum and flaked of sodium hydroxide (lye). I see only one 'metal' there. Just add water, and watch it fizz with nearly explosive force.

Or, try ordinary oven cleaner on aluminum- try the foil, it's about as pure as you can have - and see what happens. That black stuff is real hard to wash off your hands.

You want to argue that sodium is a metal? OK, then what's salt made of?

Concrete, in some ways, is deceptive; the calcuim in it acts as a buffer, allowing it to maintain an alkaline pH much longer than one might expect.

For the OP, I'd stick to cast iron and wrap the pipe with tape. That ought to work as well as anything- even exotic metals or special alloys.
 
renosteinke said:
Need two metals? Bull Puckey.

Ever see crystal Drano work? All it is made of is flakes of pure aluminum and flaked of sodium hydroxide (lye). I see only one 'metal' there. Just add water, and watch it fizz with nearly explosive force.

Or, try ordinary oven cleaner on aluminum- try the foil, it's about as pure as you can have - and see what happens. That black stuff is real hard to wash off your hands.

You want to argue that sodium is a metal? OK, then what's salt made of?

Concrete, in some ways, is deceptive; the calcuim in it acts as a buffer, allowing it to maintain an alkaline pH much longer than one might expect.

For the OP, I'd stick to cast iron and wrap the pipe with tape. That ought to work as well as anything- even exotic metals or special alloys.
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Chemistry 101.

Indeed Na(Sodium) is a metal.

Salts are the results of organic or inorganic materials of acid and base interaction.

Aluminum foil is FULL with copper. It is very difficult to produce copper-free aluminum and for food wrapping purposes the expense just isn't worth it.
 
renosteinke said:
From the manfacturer: "Reynolds Wrap? Aluminum Foil is 98.5% aluminum." You can find it on their web site.

Sounds pretty pure to me.
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As metal alloys and corrosion go, 1.5% is actually quite a lot. But we do not know how much of that is copper. :)

The highest percentage of copper deliberately introduced into a typical aluminum alloy is less than 2%.
 
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