College of Materials Science and Engineering, Beijing University of Chemical Technology, Beijing, China.
Beijing Key Laboratory of Electrochemical Process and Technology for Materials, Beijing, China.
Luminescence. 2020 Sep;35(6):885-890. doi: 10.1002/bio.3797. Epub 2020 Mar 7.
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.
在这项研究中，首次使用紫外可见分光光度法研究了阳离子和非离子咪唑啉缓蚀剂在混凝土中的迁移行为。咪唑啉可以与溴甲酚紫反应，导致吸光度降低，可用于定量计算咪唑啉的浓度。结果表明，在有无电场的情况下，非离子咪唑啉的迁移速率比阳离子咪唑啉快，这可能是由于非离子咪唑啉具有更好的水溶性。电场可以显著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得到了很大的提高。从 X 射线光电子能谱分析中可以检测到钢表面的 N 元素，验证了非离子咪唑啉的迁移行为。根据动电位极化，这种非离子咪唑啉可以显著延缓钢的腐蚀。
