Corrosion behaviour of TiC/N coating prepared by plasma electrolytic saturation on NiTi

Abstract

In this research, plasma electrolytic saturation of carbon and nitrogen was used to prepare TiC/N coating on NiTi alloy. In this regard, four types of urea-based electrolytes with various amounts of NH 4 NO 3 were employed. The effect of electrolyte composition on the characteristics of the formed layer was studied using grazing incidence X-ray diffraction and scanning electron microscopy. The results showed that the TiC 0.2 N 0.8 compound was formed in coating. The pore size of coating was increased by increasing the concentration of NH 4 NO 3 . To investigate the corrosion resistance of the coated samples, the potentiodynamic polarization test and electrochemical impedance spectroscopy were performed in Ringer's solution. It was observed that as the NH 4 NO 3 concentration of electrolyte increased, the corrosion resistance of the formed layer was reduced. Such a behaviour was attributed to the operating current as well as discharge energy enhancement which caused the deep cracks and porosities formation in the coating.

A review on wear failure of hydraulic components: existing problems and possible solutions

“…Material coating is a method of applying a thin layer of material on parent substrates in addition to enhancing their surface qualities [70][71][72]. Surface coating techniques, according to certain previous research publications, play a critical role in improving corrosion resistance qualities [73][74][75][76]. Surface coating is used to extend the life of several industrial products that regularly fail due to surface wear, including as gears, boiler surfaces, and bearings [77][78][79].…”