Contact US

Log In

Come Join Us!

Are you an
Engineering professional?
Join Eng-Tips Forums!
  • Talk With Other Members
  • Be Notified Of Responses
    To Your Posts
  • Keyword Search
  • One-Click Access To Your
    Favorite Forums
  • Automated Signatures
    On Your Posts
  • Best Of All, It's Free!

*Eng-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail.

Posting Guidelines

Promoting, selling, recruiting, coursework and thesis posting is forbidden.

Students Click Here

316 stainless and copper corrosion

316 stainless and copper corrosion

316 stainless and copper corrosion

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

RE: 316 stainless and copper corrosion

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

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

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):
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

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.

Red Flag This Post

Please let us know here why this post is inappropriate. Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students posting their homework.

Red Flag Submitted

Thank you for helping keep Eng-Tips Forums free from inappropriate posts.
The Eng-Tips staff will check this out and take appropriate action.

Reply To This Thread

Posting in the Eng-Tips forums is a member-only feature.

Click Here to join Eng-Tips and talk with other members! Already a Member? Login


Close Box

Join Eng-Tips® Today!

Join your peers on the Internet's largest technical engineering professional community.
It's easy to join and it's free.

Here's Why Members Love Eng-Tips Forums:

Register now while it's still free!

Already a member? Close this window and log in.

Join Us             Close