Tribological and corrosion behavior of flame sprayed Al–10 wt% Ti3SiC2 composite coating on carbon steel

Abstract

Pure Al coatings are extensively used in various industries but their poor wear resistance has introduced as the main drawback of them. In this study, the effect of the addition of Ti3SiC2 on the tribological and corrosion behavior of Al coating was investigated. The morphological and phase evolution of coating and powders was analyzed using scanning electron microscopy (SEM), energy-dispersive X-ray spectroscopy (EDS) and X-ray diffraction (XRD) patterns. The corrosion behavior of samples was investigated by potentiodynamic polarization test and electrochemical impedance spectroscopy (EIS). The wear behavior of coating and substrate studied by the pin-on-disc test. The results indicated that the wear resistance of Al coating in terms of friction coefficient and wear rate was significantly improved by the presence of Ti3SiC2 inclusions. According to the result of potentiodynamic polarization tests in simulated 3.5% NaCl solution, the corrosion potential of the Al/Ti3SiC2 coating is nobler than that of the pure Al one. The electrochemical impedance spectroscopy (EIS) tests indicated that corrosion resistance of Al/Ti3SiC2 coating was increased as compared with pure Al coating.