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

-----

Black oxide coating won't take

I recently had some 8620 low alloy steel castings black oxided, unfortunately we had to do some rework on the castings and the black finish was removed. We sent the castings back to be black oxided, which did not work. The castings would not form the black oxide on the surface. Can this process only be preformed once? I'm assuming we are forming Fe3O4.

Thanks in advance.

Shawn Mckinney
- Myerstown, Pennsylvania, USA
2003

One of the two most popular suppliers of Black Oxiding products used to use their "Stainless Steel Black(ing" product for plain cast iron.

Robert H Probert
Robert H Probert Technical Services

Garner, North Carolina

2003

adv.
this text gets replaced with bannerText

(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: