Tribocorrosion of Fe-based amorphous coating in simulated body fluids

Abstract

An arc-sprayed Fe-based amorphous coating with high hardness and low porosity was prepared. A tribo-electrochemical approach was used to study the tribocorrosion behaviour of the amorphous coating. The volume wear losses of the amorphous coating with different sliding paths in dry, 0.9% NaCl, and PBS solutions were measured, as well as the friction coefficient and the polarization curves in static and dynamic situations. The volume wear loss with the linear sliding path is higher than those with circular and triangle paths. Since the ions in the solution accelerate the wear, the volume loss of the amorphous coating in 0.9% NaCl solution is higher than dry and in PBS solution. The wear loss of 316L stainless steel (SS) is about 1.7 times more than the amorphous coating in PBS solution under a load of 10 N. Although 316L SS possesses better corrosion resistance than the amorphous coating in the static situation, the corrosion resistance of the amorphous coating is much better than that of 316L SS during tribocorrosion. The wear mechanism of the amorphous coating includes abrasive wear accompanying with corrosive wear. For the intrinsic superior corrosion resistance, amorphous coating shows the prospective tribology application in the corrosion environment.