Effect of erosion speed on the interaction between erosion and corrosion of the Fe-3.5 wt% B alloy in a flowing zinc bath

摘要

The effect of erosion speed on the interaction between erosion and corrosion of the Fe-3.5 wt% B alloy in a flowing zinc bath has been investigated using a rotating-disk technique. The total erosion-corrosion rate increases rapidly, whereas the pure erosion rate tends to increase linearly with an increase in erosion speed and with low damage. The increase in total erosion-corrosion rate is strongly dependent on erosion-corrosion interaction. During the erosion-corrosion process, the severe corrosion reaction roughens the surface by forming a loose corrosion layer and cracks in the anticaustic Fe_2B skeleton, which eventually facilitates erosion. The micromechanical scouring effect of liquid zinc worsens corrosion by accelerating the removal of corrosion products and causing spallation of anticaustic Fe_2B. An increase in erosion speed intensifies the micromechanical scouring effect of flowing zinc significantly. A strong erosion-corrosion interaction occurs at high erosion speed, which leads to a greater material loss rate.