-- The Home Page of the Finishing Industry
Serious Education & the most FUN
you can have in metal finishing smiley

No popups, spam, registration or passwords
on this site
current topics
topic 7561

300 vs 400 Passivation


Do both 300 and 400, specifically 420, series SS require passivation? Which one is more corrosion resistant?

Ted Browning
- Shakopee, Minnesota


No stainless steels absolutely "require" chemical passivation treatment. Now, whether your parts "should" be passivated to resist corrosion in service or processing is another matter. The 300 and 400 series alloys will generally benefit from chemical passivation, i.e., will be more resistant to corrosion. Whether the difference in corrosion resistance before and after passivation will be significant depends on how the components are processed (e.g. welded, etched, etc.) and the nature of the service conditions. In most environments, the 300 series alloys (304 and 316 are most common) are more corrosion resistant than the 400 series alloys (including 420).

Hope this helps.

larry hanke
Larry Hanke
Minneapolis, Minnesota

If you have a question in mind which seems off topic, please 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.