目前,丝束电极测量多侧重定性分析,鲜见对不同腐蚀阶段缝隙内Cl-和H+浓度分布的定量研究.采用丝束电极(WBE)联合交流阻抗谱(EIS)方法研究了Q235钢的缝隙腐蚀行为,并配合离子选择性电极传感器(ISE)对缝隙腐蚀不同阶段中的Cl-浓度和H+浓度变化进行定量分析.结果表明:在模拟海水环境(3.5 ％NaCl,pH值6.8～7.0,25℃)15 d缝隙腐蚀试验中,Q235钢的缝隙腐蚀行为在诱发期、扩大期及稳定发展期的H+浓度与Cl-浓度表现出不同的分布规律,发现了Cl-向缝内迁移与富集现象,量化了缝隙内离子变化的全过程.
Crevice corrosion behaviors of Q235 mild steel in simulated seawater were studied using a wire beam electrode (WBE) & electrochemical impedance spectroscopy (EIS) method,and iron selective electrode (ISE) was combined and used to quantitatively analyze the concentration changes of Cl-and H+ in different stages of crevice corrosion.Results showed that in the simulated seawater (3.5％NaCl,pH=6.8 ～7.0,25 ℃),after crevice corrosion test for 15 d,the H+ concentration and Cl-concentration performed different distribution characteristics in the induction period,enlargement period and stable development period of Q235 steel crevice corrosion behaviors.The migration and enrichment of Cl-were observed in crevice interior,which could quantize the whole process of iron concentration change in Q235 crevice.
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