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利用光电化学显微技术(Photoelectrochemical Microscopy,PEM)现场(in-situ)跟踪研究了钢筋电极在含氯离子的模拟混凝土孔溶液中(pH=13.8)处于点蚀孕育及发生阶段的局部光电流变化情况。实验发现,在点蚀发生区域钢筋钝化膜的光电流随着点蚀过程的发生而逐渐降低。这一现象可能与溶液中氯离子穿透钝化膜并在钢筋/钝化膜界面富集,进而从钝化膜底部逐渐溶解钝化膜的历程有关。另外局部光电流的变化在一定程度上也反映了腐蚀产物的富集与扩散特征。
The photoelectrochemical microscopy (PEM) field-in-place follow-up study of the local photocurrent changes of the rebar electrode in pitting ingestion and occurrence stage in the simulated concrete pore solution containing chloride ions (pH=13.8) Happening. It was found that the photocurrent of the steel passivation film in the area where pitting occurred was gradually reduced with the occurrence of pitting process. This phenomenon may be related to the process in which the chloride ions in the solution penetrate the passivation film and accumulate at the interface of the reinforcement/passivation film, which in turn gradually dissolves the passivation film from the bottom of the passivation film. In addition, the change of local photocurrent also reflects the enrichment and diffusion characteristics of corrosion products to some extent.