采用丝束电极（WBE）联合电化学阻抗谱（EIS）等方法研究了Q235钢在模拟海水中的缝隙腐蚀行为，并配合离子选择性电极（ISE）传感器对缝隙腐蚀不同阶段的Cl^-和H⁺变化进行观测。结果表明：缝隙腐蚀的发展过程符合氧浓差电池-闭塞电池理论；在缝隙腐蚀的诱发期与扩大期，缝内溶液中H⁺和Cl^-含量增大，缝内溶液成分的极端值分别为pH 2.43，Cl^-浓度3.45 mol/L；当缝隙腐蚀进入闭塞电池阶段后，腐蚀过程符合Bockris机理，且pH与Cl^-浓度保持着较好的线性相关；Q235钢在模拟海水中发生缝隙腐蚀的概率约为73.3%，点蚀率为6.1%。

The crevice corrosion of Q235 steel in simulated seawater was studied using a wire beam electrode (WBE) in combination with electrochemical impedance spectroscopy (EIS). In addition, iron selective electrodes (ISE) were used as a senser to monitor the concentration change of H⁺ and Cl^- in different stages of crevice corrosion. The results indicated that the propagation of the crevice corrosion complied with the theory of oxygen concentration cell followed by occluded corrosion cell. The concentration of H⁺ and Cl^- kept increasing in the initiation and enlargement periods of the crevice corrosion, and the extreme values of the composition of the solution were pH 2.43 and Cl^- concentration of 3.45 mol·L^-1 within the crevice. The corrosion progress complies with Bockris mechanism after the occluded cell began to take control with a good linear correlation between pH and the concentration of Cl^-. The crevice corrosion probability of Q235 steel was statistically estimated to be 73.3%, and the pitting ratio was 6.1%.