Home /
Search 🔍
the Site

Chime right in! (no registration req'd)


"How to black oxide Inconel"

An ongoing discussion beginning back in 2005 ...


Q. Hello,

I am new to the wire industry and would like to know how to continuous oxide Inconel wire in small diameters.


George Potter
Bob Martin Company - So. el Monte, California, USA


A. Sorry, George, I am not familiar with black oxiding of Inconel being possible. But what properties are you seeking and why? Is it just for color? Might cold blackening or anodizing be acceptable? Thanks.

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

Is Black Oxide plating on Inconel 718 possible?

March 22, 2018

Q. Hi, I sent out an Inconel 718 part for black oxide plating and the platers told me that they cannot black oxide Inconel 718. They tried to multiple times, but it will not work. Multiple other platers told me the same. Anyone here know if black oxide is possible on Inconel 718? Thank you!

Kendrick Kim
- Union City, California USA

March 2018

A. Hi Kendrick. Black oxide, according to the common vernacular, is a process for building an extremely thin (no dimensional change) black finish on steel. It happens because nitrite & other oxidizers in the boiling hot caustic solution are able to convert the surface of steel parts to this black oxidized condition. But Inconel 718 is extremely resistant to such oxidation, being over half nickel, plus 19% or so chromium, another something like 10% between molybdenum, columbium, titanium & cobalt -- leaving less than 20% iron ... so I would agree with the plating shops you've contacted.

Depending on exactly why you want/need a black finish, maybe you should talk to PVD coaters about applying a thin, hard, black layer? Good luck.


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

March 23, 2018

thumbs up sign Hi Ted, understood! That's exactly the conclusion I came to myself, but wanted to confirm that here with the pros. I am confident now in stating this to the customer. Cheers.

Kendrick Kim [returning]
- Union City, California USA

Inconel 625 black finishes?

November 15, 2018

Q. Hello, I am interested in having a black finish applied to a machined inconel 625 part. Much like black anodize for aluminum. Needs to be thin and durable. The less reflective, the better. Suggestions?

Scott Rowe
Rowe Technical Design, Inc. - Dana Point, California USA

finishing.com is made possible by ...
this text gets replaced with bannerText
spacer gets replaced with bannerImages

Q, A, or Comment on THIS thread SEARCH for Threads about ... My Topic Not Found: Start 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:

Chemicals &
Consult'g, Train'g
& Software

About/Contact    -    Privacy Policy    -    ©1995-2021 finishing.com, Pine Beach, New Jersey, USA