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Study on the preparation and corrosion inhibition of Schiff-base self-assembled membranes

Lin Liu (Key Laboratory for Synthesis and Application of the Functional Compounds, Bohai University, Liaoning, China)
Hongyu Su (Department of Key Laboratory for Synthesis and Application of the Functional Compounds, Bohai University, Jinzhou, China)
Xue Li (School of Material Science and Engineering, Northeastern University, Shenyang, China)
Yanan Wang (Department of Key Laboratory for Synthesis and Application of the Functional Compounds, Bohai University, Jinzhou, China)
Qiang Zhang (Department of Key Laboratory for Synthesis and Application of the Functional Compounds, Bohai University, Jinzhou, China)
Jianhua Qian (Department of Key Laboratory for Synthesis and Application of the Functional Compounds, Bohai University, Jinzhou, China)

Anti-Corrosion Methods and Materials

ISSN: 0003-5599

Article publication date: 5 December 2018

Issue publication date: 22 February 2019

244

Abstract

Purpose

This paper aims to evaluate the inhibitive effect and adsorption behavior of the 2-amino-5-thiol-1,3,4-thiadiazole vanillin (A) on copper in 3 per cent NaCl solution.

Design/methodology/approach

A thiazole Schiff bases were synthesized, named, 2-amino-5-thiol-1,3,4-thiadiazole vanillin (A), which was fabricated respectively on copper surface by the molecular self-assembled. Evaluation was carried out by electrochemical measurement and surface analysis techniques. Measurement of static friction coefficient scanning electron microscopy and Contact angle analysis were applied, and it is finally confirmed the existence of the adsorbed film. The inhibitive mechanism of A was evaluated by means of quantitative calculation and molecular dynamics simulation.

Findings

The electrochemical measurement indicated that the self-assembled molecular film can effectively inhibit the corrosion of copper sheet, when the concentration was 15 mmol⋅L−1 and the assembly time was 6 h, the corrosion inhibition effect was the best, reaching as high as 97.5 per cent. Scanning electron microscopy results showed that the Schiff base compound forms a protective film on the surface of the copper, which effectively blocks the transfer of corrosion particles to the metal substrate, thereby inhibiting the occurrence of corrosion. Adsorption behavior of A followed the Langmuir’s adsorption isotherm and attributed to mixed-type adsorption. The results of Quantitative calculation and molecular dynamics simulation showed that A was adsorbed on Cu (111) surface in parallel.

Research limitations/implications

In this study, the corrosion inhibition properties of Schiff base film were investigated by combining theory with experiment. Theoretical calculation is helpful to guide the synthesis of efficient and environmentally friendly corrosion inhibitors.

Practical implications

The damage caused by metal corrosion is great. The self-assembled Schiff base membrane synthesized in this paper is simple and compact, and the corrosion inhibition efficiency of copper in 3 per cent NaCl solution is 97.5 per cent.

Social implications

Inhibition of metal corrosion can better save energy and reduce economic losses.

Originality/value

The synthesized Schiff base was prepared on the copper surface by the molecular self-assembled. The Schiff base membrane has a good corrosion inhibition effect on copper in 3 per cent NaCl solution, and the corrosion inhibition efficiency is up to 97.5 per cent.

Keywords

Acknowledgements

This work is supported by the Innovation Team Project of Liaoning Province (Grant No. LT2015001) and the National Natural Science Foundation of China (21176030).

Citation

Liu, L., Su, H., Li, X., Wang, Y., Zhang, Q. and Qian, J. (2019), "Study on the preparation and corrosion inhibition of Schiff-base self-assembled membranes", Anti-Corrosion Methods and Materials, Vol. 66 No. 2, pp. 168-173. https://doi.org/10.1108/ACMM-05-2018-1932

Publisher

:

Emerald Publishing Limited

Copyright © 2018, Emerald Publishing Limited

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