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

Galvanic corrosion inconel/8630

Galvanic corrosion inconel/8630

Galvanic corrosion inconel/8630

Is there a problem with coupling Inconel 625/825 with AISI 8630 in seawater?
I dont think there is but I need to tie it down with facts.
Difference in voltage is -0.2, 8630 has largest area.

RE: Galvanic corrosion inconel/8630

There is definitly a problem for the alloy steel in this situation. There would be a problem for the steel even without the galvanic couple.

RE: Galvanic corrosion inconel/8630

I completely agree with mcguire.  Uncoated steel in a seawater environment will experience substantial corrosion.  Adding a galvanic couple to a more noble metal like a nickel-based inconel alloy will only exacerbate the problem.  You may need to look into a protective coating for the steel component, or consider making it out of something else.

RE: Galvanic corrosion inconel/8630

You should provide more information about function and service expectations.  What is your reason for combining these metals?
At depths where oxygen content is very low, for example, this may pose no risk to either alloy (it obviously won't be a concern for the Nickel alloy).  You do not say if the steel is coated - why would that not be the case anyway even if there was no dissimilar metal configuration?

RE: Galvanic corrosion inconel/8630

Sorry gents, more info.
Exterior of 8630 is painted,interior is uncoated.
However where the inconel and 8630 are in contact it is a trapped volume with no replenishement of electrolyte.

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