Letter 5087

Black oxidation - nitriding/nitrocarburizing process 

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I'd like to now more about qpq, or other similar nitriding / nitrocarburizing + black oxidation process.

Which kind of salt is used in the qpq process. What kind of cleaning processes have to be used before nitriding and before oxidation. What environmental problems result from using this salt, in particular the quenching one? Is it possible to couple a gas nitriding process to a qpq but only for the quenching-oxidising process?

Does there exist other similar HT with the same surface finishing (very important is uniformity and real black colour)? Thanks in a advance for any help.

L. Gessi
- Opera (MI) Italy

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Kolene offers the qpq process and has put a paper about it on-line here.


Ted Mooney, P.E. 
finishing.com
Brick, New Jersey

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Dear sir,

I research about plasma nitrocarburizing post oxidation. Please help me about this subject.

Sincerely yours,

Mahdi Mirjani
Iranian surface research and engineering centre - Isfahan, Iran

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