-- 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 2686

Citric acid for copper passivation?


My company is using a dilute citric acid bath to passivate copper after etching. We then assemble these passivated components into a can, then extrude the product into a rod. My question is this: What is the citric acid doing to the surface of the copper to slow oxidation? Will this hamper bonding between the components in the subsequent extrusion?

Robert Hentges
- Carteret New Jersey


Robert, Citric acid is a chelating agent which is often used in plating industry. Recently it is used in the formulation passivating stainless steel because citric acid is helpful to remove iron existing in the oxide film on stainless steels. I believe citric acid is helpful to clean the copper surface rather than passivate copper. Actually citric acid tends to remove the oxide film on copper surface instead of forming oxide film. Ling

Ling Hao
- Grand Rapids, Michigan


Can you send documentation concerning passivation of pipe (chrome).

- hassi-nessaoud


How long does it take to form a substantial oxide layer on copper? How can this be inhibited without adding a coating?

Thank you!

Dave Bucka
- Industry, California, USA


I have been working with copper and citric acid extensively. The pH value at which you are conducting your process may very much influence the results you are obtaining.

Venkata Gorantla
- New York

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.