×
INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS

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!
  • Students Click Here

*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

Jobs

Titanium gr5 and CF8M stainless steel Galvanic Corrosion

Titanium gr5 and CF8M stainless steel Galvanic Corrosion

Titanium gr5 and CF8M stainless steel Galvanic Corrosion

(OP)
Hi am exploring a design that uses Titanium 6AL-4V GR5 for cost reduction;the part would be contact with a cast cf8m part, it will be submerged salt water mix of Sodium Bromide, Sodium Chloride @ 20 to 50°C at a max 35bar  pressure. Would the design get away with galvanic corrosion and an eddy current. If not what stainless material would be recommended for this application?
Any reference links would be helpful thanks  
 

RE: Titanium gr5 and CF8M stainless steel Galvanic Corrosion

Hi Smokes,

Is the Ti being used for corrosion resistance or because of loading requirements? If the contact point isn't under any high load, I find thin walled nylon 6/6 or equivalent plastic bearings solve the problem outright by isolating dissimilar metals from each other.  Even if your contact point isn't a bolted connection, perhaps you make use of this approach in your application.

Cheers!
--Adam

RE: Titanium gr5 and CF8M stainless steel Galvanic Corrosion

Titanium tends not to have bad long term galvanic effects while initially enhancing corrosion  because of what is called polarisation where by the galvanic effect is minimised.  

RE: Titanium gr5 and CF8M stainless steel Galvanic Corrosion

But rather I would question the suitability of cast CF8M for use in this environment at all.
I would expect some localized etching of the SS, but if you do have some inhomogeneity or surface condition issues with the SS then you could get rapid local attack.
Either electrical isolation or coating of the Ti would be the ways to minimize this.

= = = = = = = = = = = = = = = = = = = =
Plymouth Tube

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!


Resources