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!

*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.

Jobs

Electroless nickel coating of confined spaces

Electroless nickel coating of confined spaces

(OP)
Hi,
I am conducting some experiments with the electroless nickel (EN) coating of the free machining brass (high lead contain material, which is not good for coating but I must use this material).
After surface cleaning and etching procedure, once the brass is submerged in the EN coating solution, I apply approx. 2V DC to kick off the process (for first 20 seconds). Positive is connected to mild steel anode and negative to brass.
I have successfully kicked off my process and obtained good quality coating for scenario I (a few times), outlined on the attached draft, but only at 'outside' brass surface (as expected).
In scenario II (see draft) I am not able to kick off the process on 'inside' or 'outside' surface.
Finally, in scenario III, where brass is cut into two halves, I was able to kick off the process at all surfaces of the brass and get the EN coating ('inside' and 'outside').

I do not understand why I cannot kick off the EN coating process for scenario II.
The inside cavity of the brass is small, thus there is limited amount of nickel in the solution there for coating, but would that be the reason of no coating at all?
Any ideas why?

P.S. Inside and outside surfaces of the brass are cleaned, etched and rinsed with use of the same procedure.

Please help. Thanks.

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


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