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合成了一种苯甲酸抗坏血酸酯(AB),利用腐蚀电化学和表面分析技术,在含3.5%NaCl的饱和Ca(OH)2溶液中研究了化合物对钢筋的缓蚀性能,结合量化计算和分子动力学模拟对其在铁表面的吸附行为和缓蚀作用机理进行了分析讨论.结果表明,AB的添加可有效降低钢筋的腐蚀电流密度,提高钢筋的耐蚀性能,表明缓蚀剂对Cl-引起的钢筋腐蚀具有良好的抑制作用,为阴极型缓蚀剂.化合物通过吸附和与铁离子形成不溶性络合物,可在钢筋表面形成一层保护膜,进而阻碍介质中Cl-与金属表面的接触,且吸附符合Langmuir等温吸附规律.量化计算和分子模拟结果证明,分子中内酯五元环和苯环既是亲核反应活性中心,也是亲电反应中心,化合物通过与铁原子间的共价键合而以平行于铁表面的方式吸附在金属表面.
A kind of benzoic acid ascorbic acid ester (AB) was synthesized. The corrosion inhibition performance of the compound on the steel bar was studied in saturated Ca (OH) 2 solution containing 3.5% NaCl by electrochemical corrosion analysis and surface analysis. Kinetics simulation was used to analyze the adsorption behavior and corrosion inhibition mechanism on the iron surface.The results show that the addition of AB can effectively reduce the corrosion current density and improve the corrosion resistance of steel bar, Of the steel corrosion has a good inhibitory effect for the cathode type corrosion inhibitor compounds by adsorption and iron ions with the formation of insoluble complexes can form a protective film on the steel surface, and then hinder the medium in contact with the metal surface Cl - , And the adsorption is in accordance with Langmuir isotherm adsorption law.The results of quantitative calculation and molecular simulation prove that the five-membered ring of lactone and the benzene ring are both the nucleophilic reaction center and the electrophilic reaction center, and the compounds are covalently bonded to the iron atom While being parallel to the surface of the iron adsorbed on the metal surface.