×
INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS

Contact US

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.

Students Click Here

Teflon coating on stainless steel springs

Teflon coating on stainless steel springs

Teflon coating on stainless steel springs

(OP)
Hi,

We need to coat the stainless steel springs with teflon (25-30 microns)in order to increase the corrosion resistance. The spring wire diamter is 0.55mm and its un-compressed length is 9.5mm. We tried a few times but failed to achieve the continuous teflon coating all round the spring wire. The suppliers say that the coating process is difficult since the item is too small.   
Could any one guide us on this please.
Thanks    

RE: Teflon coating on stainless steel springs

Pras,

Have you heard/considered XYLAN coatings ?

The company description:
 
"Xylan coatings are a family of products developed by the Whitford Company for use as: lubricant and wear resistant coating, as a seal, as a release or nonstick coating, in materials handling, and under conditions of corrosion.   Xylan comes in the 1000 Series for tough industrial applications, and in the 8100 Series, which meets FDA food contact requirements.  Multiple colors are available, whether to match their surroundings, or to provide color coding."

XYLAN has been used in chemical process plants in applications such as piping flange bolts and vessel manway bolting.

See:

www.aic-coatings.com/xylan.htm
www.whitfordww.com/
www.secoating.com/fcoatings.html

Good Luck !!!

MJC

RE: Teflon coating on stainless steel springs

Pras...

I visualize this wire-spring to be polished CRES formed to shape [hot or cold], with shap-cut ends.

The polished wire will have the greatest fatigue durability, but is very difficult to coat. Also the sharp cut ends will make it virtually impossible apply an adherent across/around the ends [can't paint a sharp edge].

What is the material and what are the environmental factors??? Would a different alloy, uncoated, be a better choice?

Have You tried: trimming the wire to length: rounding the ends by elecro/acid polishing/deburing; applying the PTFE coating to the straight-wire; then forming the spring shape?

It might also be possible to pre-coat the wire-stock and cut/form/trim as You normally do NOW... just allow the [rounded-off] ends to remain "bare"??? NOTE: "hot/warm forming" could be required to help the coating "creep" into conformance with the wound shape!

Regards, Wil Taylor

RE: Teflon coating on stainless steel springs

(OP)
Thanks MJC and wktaylor ! Your inputs will be certainly helpful to me.
Pras

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


Resources

Low-Volume Rapid Injection Molding With 3D Printed Molds
Learn methods and guidelines for using stereolithography (SLA) 3D printed molds in the injection molding process to lower costs and lead time. Discover how this hybrid manufacturing process enables on-demand mold fabrication to quickly produce small batches of thermoplastic parts. Download Now
Design for Additive Manufacturing (DfAM)
Examine how the principles of DfAM upend many of the long-standing rules around manufacturability - allowing engineers and designers to place a part’s function at the center of their design considerations. Download Now
Taking Control of Engineering Documents
This ebook covers tips for creating and managing workflows, security best practices and protection of intellectual property, Cloud vs. on-premise software solutions, CAD file management, compliance, and more. 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