plating, anodizing, & finishing Q&As since 1989
How to call out gold TiN coating
I'm calling out a TiN coating to match a previous product which was done by a company which is now closed. The drawing call for TiN coating, gold and nothing else. What is the proper way to call out the TiN coating of a part on a drawing?
Thanks in advance.
The specification of the coating should depend on the application. If it's primary deposited for improved wear resistance, you should specify a thickness of 3 to 5 microns. The deposition process may also make a difference. Most PVD processes are carried out with substrate temperatures around 450 &C, and wind up with a coating having high compressive stress. TiN can also be deposited by CVD at around 1200 &C, winding up with a low tensile stress.
Jim Treglio - scwineryreview.com
PVD Consultant & Wine Lover - San Diego,
The only industrial specification I am aware of is AMS2444 [affil link], which covers PVD TiN coatings. Acceptance tests are for thickness, adhesion, and 'quality' (color, coverage, freedom from nodules). Periodic tests include coating composition, hardness, and microstructure. It's probably getting a copy from SAE ($47.20 at www.sae.org) as a model for your own purchase document, if for no other reason.
metallurgist - E. Aurora, New York
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