为了揭示流速对N80钢冲刷腐蚀的作用机理，采用旋转圆柱电极装置结合电化学、失重法、腐蚀形貌观测法，研究了不同流速下N80钢在含砂粒的NaCl水溶液中的冲刷腐蚀行为。结果表明：随着流速的增大，N80钢的冲刷腐蚀速率先小幅增大后大幅增大；不同流速下，N80钢阴极出现氧扩散特征，其阴极反应的Tafel斜率均大于阳极反应的Tafel斜率，整个反应过程受阴极氧化还原反应控制。在实际过程中，可以通过控制流速来降低管道内腐蚀介质对管壁的冲刷腐蚀，以提高管道使用寿命。

In order to reveal the affecting mechanism of flow velocity on erosion-corrosion of N80 steel, the erosion-corrosion behavior of N80 steel in NaCl aqueous solution containing sand was studied at different flow velocities using rotary cylinder electrode device combined with electrochemistry method, weight loss method and corrosion morphology observation. The results show that the erosion-corrosion rate of the N80 steel increased slightly first and then increased obviously with the increase of flow velocity. Oxygen diffusion characteristics appeared on the cathode of N80 steel under different conditions of flow velocity. The Tafel slope of the cathodic reaction was greater than that of the anodic reaction for the N80 steel, so the whole reaction process was controlled by the cathodic oxidation-reduction reaction. In the process of oil transportation, the method of controlling the flow velocity of corrosive medium could be applied to reduce erosion-corrosion of tube wall for improving the service life of pipeline.