摘要
With a rotating cylinder electrode apparatus,the polarization behaviors of the mild steel and the stainless steel 0Cr18Ni9 in NaHCO3(0.5M)+Na2CO3(0.5M)solution with and without erodent particles were investigated and compared.The results show that the rotation speed of cylinder hardly affects the polarization behavior of sample in solution without particles but exerts a great influence on that with particles.Increasing rotation speed,the free corrosion potential shifts to positive direction and the oxygen limiting current density increases.Both the mild steel and stainless steel 0Cr18Ni9 experience a significant increase of the mass loss by increasing erosion,and erosive wear was dominated by severe micro-plowing.The insufficient mechanical strength of both materials leads to a low resistance to particle removal.Increasing peripheral velocities of the rotating cylinder enhances the corrosion rate of the mild steel.The stainless steel 0Cr18Ni9,due to a high erosive wear,also suffers from similar erosion-corrosion damage,despite that its corrosion resistance is much higher than that of the mild steel.
With a rotating cylinder electrode apparatus,the polarization behaviors of the mild steel and the stainless steel 0Cr18Ni9 in NaHCO3(0.5M)+Na2CO3(0.5M)solution with and without erodent particles were investigated and compared.The results show that the rotation speed of cylinder hardly affects the polarization behavior of sample in solution without particles but exerts a great influence on that with particles.Increasing rotation speed,the free corrosion potential shifts to positive direction and the oxygen limiting current density increases.Both the mild steel and stainless steel 0Cr18Ni9 experience a significant increase of the mass loss by increasing erosion,and erosive wear was dominated by severe micro-plowing.The insufficient mechanical strength of both materials leads to a low resistance to particle removal.Increasing peripheral velocities of the rotating cylinder enhances the corrosion rate of the mild steel.The stainless steel 0Cr18Ni9,due to a high erosive wear,also suffers from similar erosion-corrosion damage,despite that its corrosion resistance is much higher than that of the mild steel.
