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316 stainless and copper corrosion

316 stainless and copper corrosion

316 stainless and copper corrosion

(OP)
Will direct connection of Type L or K copper pipe to 316 sst underwater present a corrosion problem?

RE: 316 stainless and copper corrosion

(OP)
I dont know the conductivity but the water is quite hard.  My guess is that the TDS is high for potable water, probably over 600 ppm.

RE: 316 stainless and copper corrosion

The copper will galvanically corrode.
James Kelly

James Kelly
www.rolledalloys.com

RE: 316 stainless and copper corrosion

Your copper will not last long.
Even if you electrically isolate the parts you will see preferred attack of the Cu in these conditions.

= = = = = = = = = = = = = = = = = = = =
Rust never sleeps
Neither should your protection
http://www.trent-tube.com/contact/Tech_Assist.cfm

RE: 316 stainless and copper corrosion

Under 'normal' conditions, the copper will corrode.
Remember though, only SS in the passive state (usual) is more noble to copper.  SS can become active & corrode if the surface oxide passivating film is disrupted by the presence of certain ions or acids. A study of nobility inversion in galvanic corrosion in the Cu-316 SS system caused by Fe(+3):
http://images.katalogas.lt/maleidykla/che24/C-203.pdf
One conclusion (with which I am sure all will agree):
"From the practical point of view, any galvanic contacts of stainless steel, carbon steel and copper in water are undesirable."

For more information on preventing all types of corrosion when using stainless, see http://www.nickelinstitute.org/index.cfm?la_id=1&search=true&keywords=Guidelines+for+Corrosion+Prevention&ci_id=6579&Submit.x=14&Submit.y=3

RE: 316 stainless and copper corrosion

(OP)
Thanks to all for your responses.  I am going to install a nylon bushing between the copper and the stainless, so there will not be any direct contact.

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