×
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

wetting agent for electropoloshing stainless steel

thread135-451781

wetting agent for electropoloshing stainless steel

wetting agent for electropoloshing stainless steel

(OP)
hi,

Just planning to start EP of stainless steel items in 202 Gr. Somebody suggested to go for Wetting agent NON INONIC SURFACTANTS like(ALKYL polysorbate 20, polyglucoside, methylisothiazolinone,Sodium DODECYLPOLY(oxyethylene)sulfate).Rally confused. Can anybody help with this. Which one will the best and in how much volume to use.

Our requirement if MATT finish and not glossy. Going in with standard phosphoric +sulphuric acid combination. Any other chemical to be added to this solution. If not post rinse with diluted nitric + Hf will be fine or not?



RE: wetting agent for electropoloshing stainless steel

We never used a surfactant in our EP acid.
These solutions wet very well on their own.

= = = = = = = = = = = = = = = = = = = =
P.E. Metallurgy, Plymouth Tube

RE: wetting agent for electropoloshing stainless steel

(OP)
hi ed,

thanks for your response. Just posting text mail received from a gentlemen whom I am in touch


"The wetting agent is used in the electropolishing solution. It assists in reducing acidic vapors in the immediate area of the processing tank and reduces the “streaking” effect of gassing on parts being electropolished. It also aids in rinsing after the electropolishing process is complete. You must use a wetting agent that will withstand the extreme conditions in the acid solution"

regards
.

RE: wetting agent for electropoloshing stainless steel

You should not need a wetting agent. The purpose of acid is to remove (etch) material from the metal surface. The purpose of a surfactant is attach to the metal surface. This is counterproductive. You do need a clean surface that the acid can work upon. The dirt that can interfere with etching is often oil or fatty acids from fingerprints and other sources. This is best removed by a caustic wash (lye, sodium hydroxide) or detergents.

RE: wetting agent for electropoloshing stainless steel

We controlled gas spot formation with flow, lots of flow.

= = = = = = = = = = = = = = = = = = = =
P.E. Metallurgy, 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

White Paper – Your Construction ERP RFP Checklist
Selecting business software for a medium to enterprise-sized construction concern is extremely challenging in large part because most enterprise resource planning (ERP) suites originated in the world of repetitive manufacturing and are therefore a poor fit for a project and asset-centric business. However, midsize to large contractors need the predictable, auditable processes that ERP delivers. Download Now
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