材料期刊网

利用自行设计的ＺＳ－１型实海冲刷腐蚀实验装置，在舟山海水腐蚀试验站对３Ｃ船板钢进行了连续72ｈ的冲刷腐蚀实验，用电化学阻抗谱等测试技术进行了腐蚀检测。结果表明：海水流速为１ ｍ/ｓ、2ｍ/ｓ和2 ｍ/ｓ时，随着冲刷时间的延长，３Ｃ钢的腐蚀速度呈下降趋势。流速在１ ｍ/ｓ-６ ｍ/ｓ内，３Ｃ钢的腐蚀电位随着流速的增加逐渐升高，电化学阻抗谱为单一容抗弧，呈活化控制特征。随着流速增大，电极受到的表面切应力增大，电化学反应阻抗减小，极化阻力（Ｒｐ）随流速的变化基本呈线性下降的关系。

 Using ZS-1 type real-sea erosion-corrosion test equipment which is designed by ourselves, the 72-hour continuous erosion-corrosion experiments of 3C steels have been done at Zhoushan marine corrosion test station. Electrochemical impedance spectroscopy (EIS) measurement has been used to detect the corrosion of samples. The results show that the corrosion rate of 3C steel is decreasing with the erosion-corrosion time when the flow velocity is 1 m/s, 2 m/s and 3 m/s. In the velocity range of 1 m/s~6 m/s, the corrosion potential of 3C steel increases with the velocity increasing, electrochemical impedance spectroscopy has single capacitance impedance and shows activation controlled characteristic. With increasing flow velocity, the shear stress on the metal electrode surface and the electrochemical reaction impedance decreased. It shows a linear relation between polarization resistance (Rp) and flow velocity.