-- The Home Page of the Finishing Industry
A website for Serious Education, promoting Aloha,
& the most FUN smiley you can have in metal finishing.
    no popups, no spam
on this site
current topics

topic 2240

Electropolishing tungsten


I have 1" X 1" samples of pure tungsten. I don't have the means to mechanically polish them but I need a mirror surface for a sputtered thin film substrate. I have been trying to electropolish them with NaOH and a carbon cathode. So far I have gotten a rougher surface than I have started out with. Does anyone have any suggests for what I am doing wrong or anything else I can try?

Brian Laughlin
- North Carolina State Univ. - Raleigh, North Carolina

November 26, 2008

What voltage are you trying to electropolish your tungsten? I personally use 10.5% NaOH in distilled water, and 20 V to electropolish tungsten. I have seen some recent papers talking about 10 V, but this is approaching the etching regime for tungsten. Also, vary your stirring speed of your electrolyte - you need a uniform viscous layer to achieve a smooth surface.

Jeff Perkins
- Boise, ID, 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.