维生素在含氯混凝土模拟孔隙液中对钢筋的缓蚀作用

硅酸盐通报 ›› 2024, Vol. 43 ›› Issue (6): 2093-2101.

维生素在含氯混凝土模拟孔隙液中对钢筋的缓蚀作用

马欣眉¹, 温勇¹, 田沛丰¹, 林海孟¹, 邵帅²

1.新疆大学建筑工程学院,乌鲁木齐 830049;
2.中铁九局集团第四工程有限公司,沈阳 110013

收稿日期:2023-11-17 修订日期:2024-02-05 出版日期:2024-06-15 发布日期:2024-06-18
通信作者: 温勇,教授。E-mail:wenyong_9731@126.com
作者简介:马欣眉(1998—),女,硕士研究生。主要从事金属腐蚀与防护的研究。E-mail:echoo879968@163.com
基金资助:
国家自然科学基金(52168036);绿色低碳建筑材料关键技术研究与应用(2022B03034-2)

Corrosion Effects of Vitamins on Steel Bar in Simulated Pore Solution of Concrete Containing Chlorine

MA Xinmei¹, WEN Yong¹, TIAN Peifeng¹, LIN Haimeng¹, SHAO Shuai²

1. School of Civil Engineering and Architecture, Xinjiang University, Urumqi 830039, China;
2. China Railway Ninth Bureau Group Fourth Engineering Co., Ltd., Shenyang 110013, China

Received:2023-11-17 Revised:2024-02-05 Online:2024-06-15 Published:2024-06-18

摘要/Abstract

摘要： 为研究钢筋混凝土体系中维生素缓蚀剂的缓蚀作用,本文采用动电位极化和电化学阻抗谱测试,研究了硫胺素(VitB1)、烟酸(VitB3)、吡哆醇(VitB6)和抗坏血酸(VitC)在含氯混凝土模拟孔隙液中对钢筋的缓蚀作用,并基于密度泛函理论进行了量子化学计算,讨论了维生素对钢筋的缓蚀机理。结果表明,在含0.05 mol/L NaCl的混凝土模拟孔隙液中,VitB6的缓蚀效果最好,因为其最高占据分子轨道和Fe 3d轨道间的键合稳定性最强。每种维生素都存在一个达到最佳缓蚀率IE的特定浓度添加值,此时VitB1和VitB3表现为阳极型缓蚀剂,VitB6和VitC为混合型缓蚀剂。随着维生素浓度的增加,IE出现反向波动的趋势,这是由于缓蚀剂的极性基团吸附于钢筋表面,抑制了阴极反应,进一步加剧了阴、阳极间的不平衡。

关键词: 有机缓蚀剂, 氯离子, 电化学, 混凝土模拟孔隙液, 密度泛函理论

Abstract: In order to study the corrosion effect of vitamin corrosion inhibitor in reinforced concrete systems,the effects of thiamine (VitB1), nicotinic acid (VitB3), pyridoxine (VitB6) and ascorbic acid (VitC) on steel reinforcement in simulated pore solutions of concrete containing chlorine was investigated using dynamic potential polarization and electrochemical impedance spectroscopy tests. The mechanism of vitamin corrosion inhibition on steel reinforcement was also discussed based on density general function theory with quantum chemical calculations. The results show that VitB6 has the best corrosion inhibition effect in simulated pore solution of concrete containing 0.05 mol/L NaCl because of the strongest bonding stability between its highest occupied molecular orbital and the 3d orbital of iron. All four vitamins have a specific concentration value to achieve the best corrosion inhibition effect IE. At this time, VitB1 and VitB3 are anodic corrosion inhibitors and VitB6 and VitC are mixed corrosion inhibitors. With the increase of vitamin concentration, the IE tends to fluctuate inversely, which is due to the inhibition of cathodic reaction caused by the adsorption of polar groups on steel surface, further aggravating the imbalance between cathode and anode.

Key words: organic corrosion inhibitor, chloride ion, electrochemistry, concrete simulated pore solution, density functional theory

中图分类号:

TU528

马欣眉, 温勇, 田沛丰, 林海孟, 邵帅. 维生素在含氯混凝土模拟孔隙液中对钢筋的缓蚀作用[J]. 硅酸盐通报, 2024, 43(6): 2093-2101.

MA Xinmei, WEN Yong, TIAN Peifeng, LIN Haimeng, SHAO Shuai. Corrosion Effects of Vitamins on Steel Bar in Simulated Pore Solution of Concrete Containing Chlorine[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2024, 43(6): 2093-2101.

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