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


zinc plate ASTM - B 633 type 2

zinc plate ASTM - B 633 type 2

zinc plate ASTM - B 633 type 2

This is PVK Raju
I would like to know the Zinc plated parts acceptance criteria
Recently we have received parts from our supplier after Zinc plated as per ASTM-B-633 SC2, Type2 on that we have found visual appearance, like colour shade variation
Please suggest how to justify the color shade variation
Thanks in advance
P V K Raju

RE: zinc plate ASTM - B 633 type 2

PVK Raju,

The appearance you are referring to is commonly called the "patina". This can vary a surprising amount depending on the exact bath chemistry during that particular run but I believe typically has very little effect on the function of the coating - unless there are other abnormalities than just some variation in this patina. I am not aware of a standard for acceptable color variation of the patina, if this variation is unacceptable to you as the customer for aesthetic reasons I would suggest either developing an internal standard or at the very least specifying it somehow on the part print.

RE: zinc plate ASTM - B 633 type 2

Thanks for immediate response
Still I am waiting more suggestions from others
If required I will share photos color shade variations
Pleae suggest
Thanks in advance

RE: zinc plate ASTM - B 633 type 2

You are more than welcome to post pictures of your parts, but I don't think my answer will change much.

You are also more than welcome to await additional input, however I wouldn't hold your breath - this doesn't seem to be a very active sub-forum. Perhaps you could post it over in https://www.eng-tips.com/threadminder.cfm?pid=332 (paint and coatings engineering).

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