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#178641 - 06/07/08 12:20 PM Corrosion / Suitability for Environment  
renosteinke  Offline
Cat Servant
Member
Joined: Jan 2005
Posts: 5,316
Blue Collar Country
It's easy to think about corrosion if you're doing work on the seashore, or in a battery plant, or even in a plating shop. Yet, you often have such problems in the most mundane locations.

One, common around here, is our alkali soil. The common "Bell" box that we use outdoors is absolutely unsuited for direct contact with earth.

First, because - gasket notwithstanding - they invariable get filled with dirt and roots. Second, corrosion.

Here's a fairly recent install:

[Linked Image]

This was done, even though, just a few yards away, was this box:

[Linked Image]

There's simply nothing left of the box. True, the plant matter from the bush probably didn't help ....


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#178656 - 06/08/08 02:29 AM Re: Corrosion / Suitability for Environment [Re: renosteinke]  
gfretwell  Online Content


Member
Joined: Jul 2004
Posts: 9,117
Estero,Fl,usa
I think the PVC boxes are better in any corrosion prone area.
We have the same thing on boat docks. A bell box won't last a year before it starts "chalking" away.


Greg Fretwell

#178672 - 06/08/08 10:10 PM Re: Corrosion / Suitability for Environment [Re: gfretwell]  
sparkyinak  Offline
Member
Joined: Jul 2007
Posts: 1,327
Alaska

PVC, stainless steel, aluminium, and gavanized steel for my wet and corrosive environment (sea water). Bell boxes hold up pretty well up here.

For the most part, the wettness I deal with is rain and lots of it so for the most part, it is non-acidic. The sea water is a whole different animal. The salt likes to eat ferrous metals if left unprotected.


"Live Awesome!" - Kevin Carosa

#178682 - 06/09/08 08:45 AM Re: Corrosion / Suitability for Environment [Re: sparkyinak]  
LarryC  Offline
Member
Joined: Jul 2004
Posts: 783
Winchester, NH, US
From my underwater equipment days, we would not mix aluminum plate and stainless steel hardware, where they would get wet. The aluminum would just corrode faster.

Larry


#178687 - 06/09/08 11:24 AM Re: Corrosion / Suitability for Environment [Re: LarryC]  
gfretwell  Online Content


Member
Joined: Jul 2004
Posts: 9,117
Estero,Fl,usa
Aluminum and stainless together is always bad news in an electrolyte like salt water. There is a teflon based goo you can coat the junction with that makes it better but eventually the stainless will start eating the aluminum.


Greg Fretwell

#179379 - 07/10/08 04:35 AM Re: Corrosion / Suitability for Environment [Re: gfretwell]  
Trumpy  Offline


Member
Joined: Jul 2002
Posts: 8,222
SI,New Zealand
Interesting topic, John,
There is a galvanic chart around somewhere, I saw it some years back, it shows which metals will corrode when placed with other metals and to what degree, this is, I might add, first year apprentice electrical theory. crazy

Having said that, I work in an environment (dairy sheds) where anything is either PVC, stainless steel or heavily galvanised steel pipe.
Anything that even remotely touches concrete, is always stainless.

I remember back when PVC enclosures became prolific in the trade here, some you bought would last quite well out in the weather, some just fell to bits, due to the sunlight, thankfully most of them problems have since been ironed out.


Let's face it, these days if you're not young, you're old - Red Green grin


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