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Replacement For Hard Chrome Plating

I am looking for an alternative coating to replace Hard Chrome on a piston head which slides in a stainless steel cylinder. I am considering Titanium Nitride. The steel cylinder has a hardness of approximately 42Rc.

Tom Fritch
- Valencia, California, USA
2002

Gee, Tom, since you work for the competition, I'd say it's an EXCELLENT idea! Simply marvelous! Oh, and make sure you select a cathodic arc process, as well, for better seal life! : )

(Gosh, I'm biting my tongue so hard here I can taste the blood...)

Seriously, chat with Kim Bodily or Dan Loveless at your Utah facility before you go too far. Good luck!

Lee Gearhart
metallurgist - E. Aurora, New York
2002

Hard chrome has much better oil retention and lower coefficient of friction. In what way is the hard chrome less than satisfactory?

Ted Mooney, P.E.
Striving to live Aloha
finishing.com - Pine Beach, New Jersey
2002

Chrome Nitride may be a better choice. However since hard chrome is typically deposited much thicker than standard PVD CrN, you will want to consider how a thinner replacement may affect the application whenever replacing hard chrome with PVD coatings.

Jeff Ostman
- Olten, SWITZERLAND
2002

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