中文摘要：

采用EIS、SEM和失重法等手段研究了阴极保护技术对Q235钢的空蚀行为的影响。结果表明，在阴极保护电位-800mV附近，能够极大程度的降低基体的腐蚀速率，析氢电位（-1200mV）下，有发生氢脆的倾向。同时，对不同保护电位下空泡腐蚀的EIS结果进行拟合得到足值随时间变化特点，在自腐蚀电位下冠值随时间延长而下降，-800mV时足值有比较小的增大趋势，而在-1000和-1200mV的电位下则是变小的趋势，在-1200mV的极化电位下，冠值相比已经非常小。

英文摘要：

Effect of cathodic protection on the cavitation corrosion behavior of Q235 Steel in 3.5% NaCl solution was studied by mean of mass loss method, EIS and SEM. The result showed that nearby the cathodic protection potential of-800mV, the corrosion rate reduced dramatically. In addition, there was a trend that hydrogen embrittlement phenomenon could occur by the hydrogen evolution potential of about -1200 mV. At the same time, the EIS under cavitation corrosion condi- tion at different cathodic protection potential were fitted by software ZsimpWin and the change characteristics of the R, value with time was revealed. The R, value would decrease with time by the open circuit potential but would have an increasing trend at -800 mV while it indicated a decline trend with time by the potential - 1000 and - 1200 mV. Furthermore, it is also noticed that the Ri value was fairly small when the applied potential was -1200 mV.