×
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

Stainless steel "dissolving" in electrocoat process into anolyte

Stainless steel "dissolving" in electrocoat process into anolyte

Stainless steel "dissolving" in electrocoat process into anolyte

(OP)
We are having problems with anolyte for a electrocoating application. The colour of the anolyte (acetic acid) has changed from a normal pale yellow to a dark red/black colour. It is suspected that the 316 stainless steel anodes may be "dissolving" as high concentrations of Cr, Ni and Mo are found in the anolyte solution. A change of voltage has been tested through the anodes recently, could this be the source of the problem? Any other theories on the topic?

RE: Stainless steel "dissolving" in electrocoat process into anolyte

316 stainless, if made anodic at a voltage that puts it in the transpassive region, will dissolve. What voltage is required is a function of the specific solution and it's temerature. Your hypothesis seems quite likely.

RE: Stainless steel "dissolving" in electrocoat process into anolyte

A good place to look for more information on this topic is the website for Products Finishing magazine, specifically the painting section.  I highly recommend the site and the magazine (both available for free)-- articles, clinic, and forum are all very useful.

http://www.pfonline.com/paint/index.html

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