Novel corrosive behavior of titanium oxynitride film deposited on nickel–titanium alloy using cathodic cage plasma processing technique

Abstract

In this study, we used a cathodic cage plasma system to deposit an oxynitride coating on a nickel-titanium metallic substrate for three different processing gas compositions (60%H 2 + 40%N 2 ; NT1, 50%H 2 + 50%N 2 ; NT2%, and 40%H 2 + 60% N 2 ; NT3). The influence of various gas mixtures on surface morphology, chemical composition, and crystal structure of treated samples (NT1, NT2, and NT3) was investigated. A spectrophotometer is used to determine the amount of nickel ion leaching in a chloride-containing saline electrolyte using atomic absorption spectroscopy. Potentiodynamic polarization curves and electrochemical impedance spectroscopy depict the enhanced corrosion resistance of treated samples as compared to the base Ni-Ti sample. Titanium oxynitride coating in NT3 samples shows an excellent barrier against corrosion behavior and nickel ion leakage in a corrosive environment.

Highly response gas sensor based the Au-ZnO films processed by combining magnetron sputtering and Ar plasma treatment

“…Some strategies, such as metal doping, chemical etching and thermal annealing have been widely used to add the content of oxygen vacancies to enhance the sensing properties of the sensors [18][19][20]. Recently, the plasma treatment has been proposed by researchers to obtain rich oxygen vacancies in the oxide semiconductors [21,22]. For example, in Zhao's work, O 2 plasma modified carbon nanotubes was used to fabricate gas sensor, which showed good selectivity to CO and low detection limit of 5 ppm at room temperature [23].…”