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topic 11499

Removing TiN (Titanium Nitride) coatings



Current question:

September 28, 2020 editor's apology: slipped through the cracks and not published 'til 12/23/2020.

Q. Is it possible to use a mixture of Oxiclean (a source of Sodium percarbonate) and Sodium Hydroxide with tap water to strip TiN coatings?

Asking about Oxiclean because it would be more convenient than obtaining 30% Hydrogen Peroxide, I think Oxiclean also has about 50% soda ash in it, so have to account for that).

roberto arano
- Fountain colorado




Previous closely related Q&A's starting in:

2001

Q. IF THERE IS SOMEONE OUT THERE THAT HAS HAD EXPERIENCE, I NEED TO STRIP TITANIUM NITRIDE FROM HIGHLY POLISHED TOOL STEEL (H-13 PLASTIC MOLDS) AND I CANNOT FIND REFERENCE IN ANY OF MY TEXT BOOKS ABOUT THIS. DOES ANYONE HAVE A RELIABLE CHEMICAL OR ELECTROCHEMICAL METHOD THAT WILL NOT ATTACK THE SUBSTRATE? WHAT WE HAVE DONE IN THE PAST IS TO ABRADE IT AWAY WITH VERY FINE ABRASIVES, BUT THE GEOMETRY WAS VERY SIMPLE, WHICH IS NOT THE CASE FOR THESE MOLDS.

THANKS IN ADVANCE.

Guillermo Marrufo
Monterrey, NL, Mexico


2001

A. We have removed TiN with a warm solution of nitric acid. We have also used glacial hydrogen peroxide. We have better results with the nitric, but we are stripping from noble metals.

Bruce Platt
- Columbia, Maryland, USA


!! Readers: note carefully Bruce's mention that his substrates are noble metals (which are resistant to nitric acid); be very careful about putting other substrates into nitric acid (especially steel, which may emit clouds of toxic NOx).

Regards,

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



To minimize search efforts and to offer multiple viewpoints, we combined previously separate threads onto this page. Please forgive any resultant repetition, failures of chronological order, or what may look like readers disrespecting previous responses -- those other responses may not have been on the page at the time :-)



2001

Q. Is there any method to remove Titanium Nitride coating without affecting the base material?

Vasudevan Swaminathan
Vasudevan Swaminathan
- Chennai, Tamil Nadu, INDIA


affil. link
"Handbook of Physical Vapor Deposition (PVD) Processing"
from Abe Books

or

2001

A. Dear Vasudevan:

I posed the same question few months ago and got answers. My substrate was alloy steel and hydrogen peroxide mixed with caustic soda worked. You didn't say your base metal, but look into this site. I am sure you also will.

Regards,

Guillermo Marrufo
Monterrey, NL, Mexico


2001

A. Stripping of Titanium Nitride. H202 and EDTA, some of one, a slug of the other, and moderate heat. Ti-nitride all gone, base metal Okay.

Jon Quirt
- Fridley, Minnesota


2001

A. Dear sir,

How to reach that formula? Tell me more for a clue.

Best regards.

Prasarn Hutpattanasilp
- Samutsakorn, Center, Thailand

Note to Readers: Letter 5007, "Stripping titanium nitride PVD coatings" offers additional perspectives on stripping titanium nitride coatings. But you must always specify the substrate material before anyone can suggest a stripper that will remove the titanium nitride without attacking the substrate.



Stripping PVD titanium coatings from stainless steel

2004

Q. My company runs PVD coatings and this new project involves PVD titanium coating over 440 stainless steel. My question is if anyone can tell me the chemicals used to strip this type of coating.

Fidel Flores
PVD COATINGS - Tecate, California, USA


2004

A. My memory is not exact, but you are looking to use chemicals that follows. Hydrogen peroxide, sodium pyrophosphate, DI water, and caustic soda. This works extremely well if there is any Aluminum in the coatings. If it is straight TiN, use the peroxide, and soda ash to reduce the pH level of the solution.

David Packer
- Lansing, Michigan



To minimize search efforts and to offer multiple viewpoints, we combined previously separate threads onto this page. Please forgive any resultant repetition, failures of chronological order, or what may look like readers disrespecting previous responses -- those other responses may not have been on the page at the time :-)



2005

Q. I am doing PVD coating of TiN on Stainless steel articles and nickel coated brass articles. I want to know how to strip TiN coating from S.S articles and nickel plated brass items. I will highly appreciate your help.
Regards,

Patel Denish Khodidas
plating shop - Rajkot, Gujarat, India


2005

A. Hydrogen peroxide will strip TiN.

jim treglio portrait
Jim Treglio - scwineryreview.com
PVD Consultant & Wine Lover - San Diego, California


2006

A. Yep H202 -- and throw in some EDTA.

Jon Quirt
- Minneapolis, Minnesota



February 14, 2011

Q. I am using Hydrogen Peroxide & caustic soda to remove TiN Coating from M50 tool. Having a recent concern with pitting corrosion in the areas were the TiN has been removed. Any possible root causes?

Ron Rhoads
- Lason, South Carolina



January 13, 2012

Q. I had some piston rings with a 5 mil titanium nitride coating (which I needed to remove in order to remelt the rings and do a ferrous analysis via an Optical Emission Spectrophotometer).

I tried a solution of hydrogen peroxide and sodium hydroxide as suggested. After 10 minutes of active bubbling, I removed the part from the solution and noted no visual change evident. The same observation was made after another 10 minutes, at which point I threw in some EDTA for good luck. Another 10 minutes ... no difference.

Finally, I let the things sit for 3 hours in the solution. The bubbling has calmed down, and there's still no observable change to the titanium nitride layer.

If the H2O2 method truly works, how long should it take?

Kurt Snyder
- Warren, Michigan, USA



Stripping Titanium and Chromium Carbide

February 14, 2013

Q. Can anyone help me the procedure to strip Ti and Cr carbide coated through PVD route?

Ramasubramanian Sankara Bhatter
- Bangalore, India

----
Ed. note: This thread addresses stripping titanium nitride coatings and is long already; so please see letter 28753 for "Stripping Carbide Coatings".


March 14, 2013

A. Sir,
A mixture of caustic soda and hydrogen peroxide solution is suitable for slow stripping, and the most dangerous acid, HF, is for fast stripping of titanium nitride.

DILEEP KUMAR
pvd technologies - kochi,kerala,india



Stripping titanium nitride with H202 and EDTA

August 31, 2015

Q. Could you please provide the concentrations for mixing them [hydrogen peroxide, caustic, and EDTA], and is there any associated health risks using these chemicals together?

Robert Scott
- Huntington Beach, California


March 19, 2019

A. My experience of stripping of TiN/ AlTiN on mold steel/ tool steel/HSS (M2):

1) Hydrogen Peroxide 35% to 38% concentrated
2) Sodium Hydroxide aka caustic soda (add accordingly between 20g to 30g each time to activate the stripping)
3) EDTA (1/2 teaspoon only to suppress the foaming reaction if bath reaction is overwhelming)

Take parts out every 30 mins rinse in DI water to check for corrosion and pitting.. (which normally it doesn't)

Ricky Chan
Diacoat Technologies Co., Ltd - Thailand, Pathumthani

----
Ed. note: Please see also letter 5007 for still more discussion about stripping titanium nitride coatings.


adv.
Metalx nickel stripper

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