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Corrosion resistance of TiN

How corrosion resistant is titanium nitride? Would a thicker TiN film provide better chemical protection, if so, what's the minimum thickness?

WY Wong
- HK

My information is that TiN coatings are too porous to function for corrosion resistance, so if the substrate is not corrosion resistant it must be plated with a corrosion resistant material before the TiN.

Ted Mooney, P.E.
Striving to live Aloha
finishing.com - Pine Beach, New Jersey
Ted is available for instant help
or longer-term assistance.

TiN has a columnar structure on the substrate. Typical coating thickness is 2-3 microns. Corrosive attacks are usually generated by gassing that would attack the substrate through angstrom level porosity in the coating. The corrosion occurs from the substrate out through the coating. A chrome based PVD coating such as Chrome Carbide or Chrome Nitride would dramatically improve the situation.

Blair Woodring
- East Petersburg, Pennsylvania, USA

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