Investigation and Comparison of Wear Properties of Hard Chrome, Gas Nitriding and Nitriding of Hard Chrome Steel Surface

In this article in order to control wear properties of 1.7765 steel with many application in gas corrosive enviroment with high pressure and temperature, the effect of hard chrome coating, gas nitriding coating and nitriding of hard chrome coating is investigated. All of specimens, in every coating method is inspected with optic microscop, micro hardness testing, XRD testing, pin on disk and oxidizing testing. Results of this investigations show that structur of chromenitrided surface mainly has CrN in surface with chrome layer that increase depth and amount of hardness, wear resistance and oxidizing resistance. Also there is not any difference in friction factor of chrome-nitrided sample and raw sample.