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Posted by David Pye on October 25, 2007 at 20:25:41:

In Reply to: plasma nitriding appearance posted by behrooz on July 22, 2007 at 07:34:17:

: hi forum,how we can get dark black surface in plasma nitriding of 420 stainless steel instead of gray color surface.
On completion of your process cycle, purge out the process chamber with nitrogen and follow the completed purge with a backfill of an oxygen bearing gas. Plateg can assist you with this technology. The color will depend on both time at temperature and the temperature selected. What you are doing is oxidizing the steel surfacve. The oxide thickness will depend on the time and the temperature.
Best Regards to you David. www.pyemet.com

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Comments: : : hi forum,how we can get dark black surface in plasma nitriding of 420 stainless steel instead of gray color surface. : On completion of your process cycle, purge out the process chamber with nitrogen and follow the completed purge with a backfill of an oxygen bearing gas. Plateg can assist you with this technology. The color will depend on both time at temperature and the temperature selected. What you are doing is oxidizing the steel surfacve. The oxide thickness will depend on the time and the temperature. : Best Regards to you David. www.pyemet.com
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