-- The Home Page of the Finishing Industry
23+ years of serious education, promoting Aloha,
& the most fun you can have in metal finishing smiley
    no popups, no spam
on this site
current topics
topic 7576

How Do I Remedy Suspected El Ni on El Ni Galling?


I have often used electroless nickel plating on low carbon or case hardened tubular components. I currently have two tubular members which slide over each other. We specified (without much thought) electroless nickel on both members and now experience galling or a like phenomena especially when the parts have no tarnishing or when assembled after a vacuum baking to increase the hardness. I am coming to suspect that I will need to use dissimilar platings or find an conversion coating. The parts are sometimes lubricated and sometimes used without lubrication. They can see high contact pressures which is one reason we opted for the El Ni with baking. Any insight would be helpful. We would like to keep the platings in the same color range. As mentioned they are tubular 10:1 l/d.

Thanking responses in advance...

George Dewey
- Palatine, Illinois, USA


Hi phosphorus electroless nickel (10% P or higher) against Mid-Phosphorous electroless nickel has worked without galling. A better solution, but more expensive, is to use electroless nickel-PTFE (or CFx EN) for one EN surface. the lubricating particles codeposited with the Electroless nickel provide an anti-galling combination. (PTFE is generic for "Teflon", a trade name of E I Dupont Co) CFx is similar to PTFE but will withstand higher operating temperatures.

don baudrand
Don Baudrand
Consultant - Poulsbo, Washington

(Don is co-author of the
book "Plating on Plastics")


EN vs EN has a coefficient of friction of .45, En vs Steel is .38 hard chrome vs hard chrome is .43 hard chrome vs steel .21 is the winner. I do not have any data on EN vs. ENPTFE. My experience with ENPTFE is you have to try it out you can not predict how it will work.It is well worth looking into.

Todd Osmolski
- Charlotte, North Carolina, USA

This public forum has 60,000 threads. If you have a question in mind which seems off topic to this thread, you might prefer to Search the Site

ADD a Comment to THIS thread START a NEW threadView CURRENT TOPICS

Disclaimer: It's not possible to diagnose a finishing problem or the hazards of an operation via these pages. All information presented is for general reference and does not represent a professional opinion nor the policy of an author's employer. The internet is largely anonymous & unvetted; some names may be fictitious and some recommendations may be deliberately harmful.

  If you need a product/service, please check these Directories:

JobshopsCapital Equip. & Install'nChemicals & Consumables Consult'g, Train'g, SoftwareEnvironmental ComplianceTesting Svcs. & Devices

©1995-2018, Inc., Pine Beach, NJ   -   About   -  Privacy Policy
How Google uses data when you visit this site.