蛋氨酸苯甲醛席夫碱对碳钢在1 mol/L HCl溶液中的缓蚀性能

王秀梅; 董畅; 邓娟; 李卓; 田宇楠

doi:10.16490/j.cnki.issn.1001-3660.2026.14.007

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表面技术 ›› 2026, Vol. 55 ›› Issue (14) : 77-88. DOI: 10.16490/j.cnki.issn.1001-3660.2026.14.007

腐蚀与防护

蛋氨酸苯甲醛席夫碱对碳钢在1 mol/L HCl溶液中的缓蚀性能

王秀梅^*, 董畅, 邓娟, 李卓, 田宇楠

作者信息 +

Corrosion Inhibition Property of Methionine-benzaldehyde Schiff Base for Carbon steel in 1 mol/L HCl Solution

WANG Xiumei^*, DONG Chang, DENG Juan, LI Zhuo, TIAN Yunan

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文章历史 +

摘要

目的以醛胺缩合法合成一种蛋氨酸苯甲醛席夫碱(MBSB)化合物,研究其对碳钢在1 mol/L HCl溶液中的缓蚀性能,探讨其与碳钢的相互作用模式,分析其吸附机理。方法以蛋氨酸和苯甲醛为原料,在NaOH的催化下经过脱水反应制备席夫碱。采用腐蚀失重实验、电化学测试、表面分析和分子动力学模拟等方法探究了MBSB对碳钢在1 mol/L HCl溶液中的缓蚀性能。结果 MBSB对碳钢在1 mol/L HCl溶液中的腐蚀起到优异的抑制作用,缓蚀效率随着MBSB添加浓度的增大而升高,随着温度的升高而逐渐降低,在303 K,MBSB添加浓度为150 mg/L时,缓蚀效率为96.8%（腐蚀失重结果）;MBSB是一种同时抑制阳极碳钢溶解和阴极析氢过程的混合型缓蚀剂。MBSB的添加使碳钢的电荷转移电阻和腐蚀反应活化能均增加。MBSB在碳钢表面的吸附遵循Langmuir等温吸附规律,是自发的物理吸附和化学吸附过程。MBSB在碳钢表面呈现近似平行的吸附构型,与碳钢表面发生相互作用而牢固吸附。计算的吸附能约为水吸附能的20倍,可以取代水分子而吸附于碳钢表面。结论蛋氨酸苯甲醛席夫碱是碳钢在酸性溶液中的优良缓蚀剂,其通过静电引力及杂原子、—C==N—和苯环与碳钢表面进行多点位作用而形成缓蚀功能膜,为工业应用提供了理论依据、奠定了坚实的基础。

Abstract

This work aims to synthesize a new organic compound named as methionine-benzaldehyde Schiff base (labeled MBSB) by condensation of benzaldehyde and methionine under the catalysis of sodium hydroxide, investigate MBSB as a corrosion inhibitor for carbon steel in 1 mol/L HCl solution through weight loss measurements, electrochemical tests, surface micro-morphology analysis and molecular dynamics simulation. The possible adsorption mechanism was discussed. MBSB demonstrated excellent performance for carbon steel in 1 mol/L HCl solution. The inhibition efficiency increased with the increasing concentration of MBSB gradually and reached as high as 96.8% with the addition of 150 mg/L MBSB at 303 K. Although the inhibition of MBSB showed a decreased trend with the elevated temperature, the value of 94.6% was achieved with the maximum concentration of MBSB at 333 K revealing that MBSB still kept considerable corrosion suppressing ability for carbon steel at higher temperature. Whereas, the corrosion rate of carbon steel gave the opposite results. MBSB prevented both anodic oxidation of carbon steel and cathodic hydrogen evolution reactions simultaneously and behaved as a mixed-type corrosion inhibitor with ΔE_corr<85 mV. Under the existence of MBSB in 1 mol/L HCl solution, the cathodic polarization curves of carbon steel had no obvious change; while, anodic polarization plots presented clear three parts at higher concentration classified as an inhibition zone, an inhibitor desorption zone and a blank solution corrosion zone from the polarization initial potential to the final potential meaning that the inhibition mode of MBSB for carbon steel was as a function of the potential value. The adsorption of MBSB on the surface of carbon steel followed the Langmuir isotherm. The related thermodynamic parameters were calculated and discussed. The adsorption was a spontaneous process including chemisorption and physisorption. The formation of the inhibitive film was due to electrostatic attraction and the electron transferring or sharing between the lone pair electrons of heteroatoms, the —C==N— functional group, the benzene ring and the carbon steel surface leading to increased surface coverage of MBSB molecules on the carbon steel surface. The addition of MBSB enhanced the charge transfer resistance and increased activation energy of carbon steel. The relatively planar adsorption configuration of MBSB on carbon steel surface enabled effective and strong MBSB adsorption on the carbon steel surface. The obtained adsorption energy of MBSB on carbon steel surface from molecular dynamics simulation almost approached 20 times as much as that of water ensuring MBSB adsorption on the carbon steel surface by easy displacement of H₂O molecules. The excellent corrosion inhibition was further confirmed by scanning electron microscope, the surface of carbon steel was more even and much smoother with MBSB than that without MBSB. The transformation of MBSB from free molecules to activated Fe-MBSB complexes resulted in a lower ΔS_a value indicating the decrease in the degree of disorder in the system of carbon steel corrosion in 1 mol/L HCl solution. The prominent inhibition performance of MBSB for carbon steel in 1 mol/L HCl solution provides a theoretical basis and lays a solid foundation for application in a variety of industries.

导出引用

王秀梅, 董畅, 邓娟, 李卓, 田宇楠. 蛋氨酸苯甲醛席夫碱对碳钢在1 mol/L HCl溶液中的缓蚀性能[J]. 表面技术. 2026, 55(14): 77-88

WANG Xiumei, DONG Chang, DENG Juan, LI Zhuo, TIAN Yunan. Corrosion Inhibition Property of Methionine-benzaldehyde Schiff Base for Carbon steel in 1 mol/L HCl Solution[J]. Surface Technology. 2026, 55(14): 77-88

中图分类号： TG172

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