含氧有机物与十二烷基苯磺酸钠复配物在3.5%NaCl饱和Ca(OH)_2溶液中对钢筋的缓蚀与协同效应

Inhibition and Synergistic Effect of Mixtures of Oxygen- containing Organic Compounds with Sodium Dodecyl Benzene Sulfate on Steel Rebar Corrosion in 3.5%NaCl Saturated Ca(OH)_2 Solution

将3种含氧有机物(山梨醇、葡萄糖和抗坏血酸)分别与十二烷基苯磺酸钠(SDBS)进行复配,利用线性极化、动电位扫描和电化学阻抗技术,在3.5%NaCl(质量分数)饱和Ca(OH)2溶液中研究了不同比例复配物对钢筋的缓蚀性能,基于量化计算结果和软硬酸碱理论(HSAB),分析探讨了复配物对钢筋的缓蚀机理,以及化合物间的缓蚀协同效应。结果表明,碱性Cl-溶液中3种含氧化合物对钢筋的缓蚀性能依次为:山梨醇<葡萄糖<抗坏血酸,且缓蚀效率与化合物作为Lewis碱的硬度呈正相关性。与SDBS复配后均表现出一定的缓蚀协同效应,其中以山梨醇与SDBS复配后协同效应最好。

The inhibition and synergistic effect of three kinds of oxygen-containing organic compounds （i.e. sorbitol, glucose and ascorbic acid） with sodium dodecyl benzene sulfate （SDBS） on the corrosion of steel rebar in 3.5% NaCl （mass fraction） saturated Ca（OH）2 solution were investigated using linear polarization, potentiodynamic polarization and electrochemical impedance spectroscopy （EIS） techniques. Then the relevant mechanism of the corrosion inhibition and synergistic effect was discussed in terms of quantum chemical calculations and hard and soft acids and bases （HSAB） principle. The results indicated that the inhibition efficiency of the oxygen-containing compounds increased in the follow order： sorbitol〈glucose〈ascorbic acid, the highest inhibition efficiency of 96.9% was obtained for the inhibitor ascorbic acid, and had a positive correlation with their absolute hardness as Lewis bases in alkaline chloride solution. A significant synergistic effect appeared when three organic compounds mixed with SDBS in different portions, however, the synergistic effect of sorbitol with SDBS was the strongest.