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利用自行设计的动态模拟旋转装置,用失重法和电化学测试法通过改变转速、温度等条件研究了工业纯钛和00Cr25Ni22Mo2不锈钢在1mol/L H2SO4 溶液中的冲刷腐蚀。结果表明:随着转速的增加和温度的升高,工业纯钛和00Cr25Ni22Mo2不锈钢的冲刷腐蚀速度增大,高温(83℃、92℃)转速高于4.18m/s时腐蚀增加更明显;在本实验体系下,电化学因素对冲刷腐蚀的协同效应起相当大的作用;工业纯钛和00Cr25Ni22Mo2不锈钢在1mol/L H2SO4溶液中的阻抗图谱为单一容抗半圆弧,增大转速降低了极化电阻的数值,但不改变阻抗图谱的形状,说明冲刷作用加速了材料的腐蚀,但并未改变金属的腐蚀历程和溶解机制。

Erosion-corrosion of Ti and 00Cr25Ni22Mo2 stainless steel in 1mol/L H2SO4 solution was studied with the aid of a self-designed rotating apparatus. The experimental results showed that the erosion-corrosion rate of Ti and the stainless steel increased with increasing rotating speed and increasing temperature, and it approached the maximum at high rotating speed(>4.18m/s) and at high temperature(83℃、92℃).In the present experimental condition, the electrochemical factor played a more important role than the hydrodynamic factor in erosion-corrosion. The Nyquist plots for Ti and 00Cr25Ni22Mo2 stainless steel in 1mol/L H2SO4 solution presented single capacitive loops. Increase in rotating speed reduced the value of polarization resistance of both the materials, but did not change their characteristics of EIS,showing that erosion effect did not change their corrosion mechanism.

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