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Quantum chemical studies on some new bipyrazole derivatives as corrosion inhibitors for steel materials

Hong Ju (College of Mechanical and Electronic Engineering, China University of Petroleum, Qingdao, China)
Jiejing Chen (College of Mechanical and Electronic Engineering, China University of Petroleum, Qingdao, China)
Can Sun (College of Mechanical and Electronic Engineering, China University of Petroleum, Qingdao, China)
Yan Li (College of Mechanical and Electronic Engineering, China University of Petroleum, Qingdao, China)

Anti-Corrosion Methods and Materials

ISSN: 0003-5599

Article publication date: 3 May 2016

221

Abstract

Purpose

The purpose of this study is to perform quantum chemical calculations based on the DFT method on four bipyrazoles used as corrosion inhibitors for the plain carbon (“mild”) steel in acid media to determine the relationship between inhibition efficiency and the molecular structure of inhibitors.

Design/methodology/approach

Several quantum chemical parameters, such as the charge distribution, energy and distribution of highest occupied molecular orbital and lowest unoccupied molecular orbital, the absolute electronegativity (χ) values and the fraction of electrons (△N) transferring from inhibitors to the steel surface, were calculated and correlated with inhibition efficiencies.

Findings

The results showed that the inhibition efficiency of bipyrazole increased with the increasing in EHOMO, and the areas containing N atoms were the most probable sites to donate electrons for adsorbing the inhibitor molecules onto the metal surface.

Originality/value

It is a useful method to investigate the mechanisms of reaction by calculating the structure and electronic parameters, which can be obtained by means of theoretical quantum theory. Thus, the behavior and mechanism of the organic inhibitors can be obtained. Quantum chemical method can also be used to guide the selection and molecular design of inhibitors.

Keywords

Acknowledgements

This work was supported by grant from “National Natural Science Foundation of China (41206063)” and “the Fundamental Research Funds for the Central Universities (15CX05023A, 14CX02201A)”.

Citation

Ju, H., Chen, J., Sun, C. and Li, Y. (2016), "Quantum chemical studies on some new bipyrazole derivatives as corrosion inhibitors for steel materials", Anti-Corrosion Methods and Materials, Vol. 63 No. 3, pp. 231-235. https://doi.org/10.1108/ACMM-11-2015-1615

Publisher

:

Emerald Group Publishing Limited

Copyright © 2016, Emerald Group Publishing Limited

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