Galvanized Conduit Corrosion with Stainless Clamps

[xguard]

I recently heard you shouldn't mix stainless and galvanized materials due to corrosion. I thought this was pretty typical. Any concerns using stainless unistrut and conduit/pipe clamps with rigid galvanized conduit?

 

[petersonra]

I recently heard you shouldn't mix stainless and galvanized materials due to corrosion. I thought this was pretty typical. Any concerns using stainless unistrut and conduit/pipe clamps with rigid galvanized conduit?

I would not be inclined to mix the two unless I had some kind of insulator between them.

 

[GoldDigger]

But when you need to mechanically join aluminum and galvanized, the common procedure is to use a stainless washer and stainless bolt and nut.

 

[petersonra]

there are also varying grades of SS.

the more common types of SS like 302 and 304 are much more of a problem than 316 in non-galvanic corrosion.

here is some solid information on galvanic corrosion of SS.

http://www.ssina.com/corrosion/galvanic.html

 

[big john]

My understanding is that some grades of stainless like 18-8 are much more susceptible to galvanic corrosion than others. I'll have to read petersona's link because I thought all the 300 grades were pretty resistant to galvanic reaction.

Silly question, is this a dry location? You don't have any reaction without an electrolyte.

 

[xguard]

My understanding is that some grades of stainless like 18-8 are much more susceptible to galvanic corrosion than others. I'll have to read petersona's link because I thought all the 300 grades were pretty resistant to galvanic reaction.

Silly question, is this a dry location? You don't have any reaction without an electrolyte.

It's outdoors.