Erosion-corrosion resistant property of directionally solidified Fe-3.5B alloy in flowing liquid zinc

The effects of orientation and space of Fe₂B on erosion-corrosion resistant property of directionally solidified Fe-3.5B alloy in flowing liquid zinc were investigated by a rotating disk technique, and microstructural morphology of erosion-corrosion interface was observed. The results show that the erosion-corrosion rate quickly decreases with the extension of erosion-corrosion time when the Fe₂B is parallel to the flowing direction of liquid zinc (parallel sample, labeled as Fe₂B_// sample) while it slowly decreases with the extension of erosion-corrosion time when the Fe₂B is perpendicular to the flowing direction of liquid zinc (perpendicular sample, labeled as Fe₂B_┴ sample). When the space of Fe₂B is 3.67 μm, the erosion-corrosion rate of Fe₂B_// sample is minimum, while the erosion-corrosion rate of Fe₂B_┴ sample reaches the minimum value when the space of Fe₂B is 1.87 μm. The Fe₂B_// sample forms a good erosion-corrosion compound layer which shows an "interface pinning effect" and greatly inhibits erosion-corrosion.