In this study, UV–visible light spectrophotometry was used for the first time to examine the migration behaviours of cationic and nonionic imidazoline corrosion inhibitors in concrete. Imidazoline can react with bromocresol purple resulting in a reduction in absorbance, which can be used to calculate quantitatively imidazoline concentration. The results showed that the migration rate of nonionic imidazoline was faster than that of cationic imidazoline with or without the presence of an electric field, possibly because of the better water solubility of nonionic imidazoline. The electric field could significantly accelerate the migration rate of the cationic and nonionic imidazoline. However, the penetration performance of nonionic imidazoline was much improved compared with that of cationic imidazoline in concrete. From X‐ray photoelectron spectroscopy analysis, the N element could be detected on steel, verifying the migration behaviour of the nonionic imidazoline. This nonionic imidazoline could markedly retard steel corrosion according to potentiodynamic polarization.

中文翻译：

---

紫外可见分光光度法研究咪唑啉缓蚀剂在混凝土中的迁移行为。

在这项研究中，紫外可见分光光度法首次用于检查阳离子型和非离子型咪唑啉缓蚀剂在混凝土中的迁移行为。咪唑啉可与溴甲酚紫反应，导致吸光度降低，可用于定量计算咪唑啉浓度。结果表明，无论有无电场存在，非离子咪唑啉的迁移速率都比阳离子咪唑啉的迁移速率快，这可能是由于非离子咪唑啉的水溶性更好。电场可以显着加速阳离子和非离子咪唑啉的迁移速率。然而，与阳离子咪唑啉相比，非离子咪唑啉在混凝土中的渗透性能有了很大的提高。通过X射线光电子能谱分析，可以在钢上检测到N元素，从而验证了非离子咪唑啉的迁移行为。这种非离子咪唑啉根据电位动力学极化作用可以显着延迟钢的腐蚀。