Erosion-corrosion characteristic of high velocity ARC sprayed FeCrAl and 3Crl3 coating

The erosion-corrosion behavior and mechanism of high velocity arc sprayed FeCrAl and 3Crl3 coating in acid slurry were studied by liquid-solid two-phase flow erosion-corrosion tester. Morphology of the surfaces after erosion-corrosion was observed using a scanning electron microscope (SEM). It was found that the damage of coatings reinforced as erosion speed increased. The erosion-corrosion mass loss rate of FeCrAl coating was much lower than that of 3Crl3 coating. FeCrAl coating had better corrosion resistance than 3Crl3 coating. In weight loss process of FeCrAl coating erosion was dominating, and corrosion played the same role for 3Crl3 coating. It was observed that the maximum value of erosion-corrosion mass loss rate of both coatings appeared when the erosion angle was at 30 degree. Cutting was dominating in erosion-wear mechanism at low angles, while both cutting and impact took effect at high angles.