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

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

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

Corrosion and Protection

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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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.

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corrosion inhibitor / acidic corrosion / carbon steel / adsorption / electrochemistry / molecular dynamics simulation

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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

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