Aloha, fun & authoritative answers -- no cost, no registration, no passwords, no popups
(as an eBay Partner & Amazon Affiliate we earn from qualifying purchases)

Where the
world gathers for metal finishing
Q&As since 1989

-----

Change in Surface Structure of 304L Stainless Steel

Is there a way that the surface structure of 304L Stainless Steel can be changed during a hand finishing operation? Specifically, putting a Matte finish on the steel. We are seeing a pitting issue with the 304L Stainless Steel with this type of finish and processing through an acid etch of 20% HNO3 and 3% HF. When the same type of finish is applied to regular 304 Stainless Steel we do not see the same problem. Any ideas would be greatly appreciated.

Ronald Simpson
- Phoenix, Arizona, USA
2002

It's not the surface structure; it's probably oils left behind that are turning the passivation bath into an aggressive organic acid. Cures are very very extended cleaning times, and very sharp tools. See our FAQ on Passivation of Stainless Steel. Good luck.

Ted Mooney, P.E.
Striving to live Aloha
finishing.com - Pine Beach, New Jersey
2002

(No "dead threads" here! If this page isn't currently on the Hotline your Q, A, or Comment will restore it)

Q, A, or Comment on THIS thread -or- Start a NEW Thread

Disclaimer: It's not possible to fully 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 might be harmful.

If you are seeking a product or service related to metal finishing, please check these Directories: