Surface passivation treatment and tribological properties of 1Cr18Ni9Ti stainless steel in hydrogen peroxide solution

Abstract

The tribological properties of the 1Cr18Ni9Ti stainless steel (1Cr18Ni9Ti SS) in different concentrations of hydrogen peroxide. The characterized techniques, including the Electro-chemical measurement system (CS3000) and X-ray photoelectron spectroscopy (PHI5702) were used to study the electrochemical behavior and chemical composition of the passive film on the 1Cr18Ni9Ti SS surface. The wear behavior of 1Cr18Ni9Ti SS/GCr15 steel rubbing pairs was investigated using a pin-on-disc tribometer. The friction coefficient and wear loss were collected and analyzed, TR240 profilometer, automated 3D non-contact surface analysis (STIL) and SEM were employed to examine surface topographies, wear track, and microstructure on the worn surfaces of tested samples. The results indicate that the corrosion resistance of nitric acid passivated 1Cr18Ni9Ti SS increased significantly due to the existence of passivation film which was mainly composed of chromic oxide. Moreover, 1Cr18Ni9Ti SS passivated with diluted nitric acid exhibited lower friction coefficient and higher wear resistance than unpassivated one in hydrogen peroxide. It is suggested that the main wear mechanism was a mixture of adhesive wear, abrasive wear and corrosive wear for the passivated and unpassivated 1Cr18N9Ti SS in different concentration of hydrogen peroxide. Whereas the adhesive wear took a large alleviation in 90% H2O2 compared with other concentration.