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Corrosion inhibition and the structure-efficiency relationship study of two cationic surfactants

Gang Chen (College of Chemistry and Chemical Engineering, Xi’an Shiyou University, Xi’an, China)
Jiao Lin (College of Chemistry and Chemical Engineering, Xi’an Shiyou University, Xi’an, China)
Qiaona Liu (College of Chemistry and Chemical Engineering, Xi’an Shiyou University, Xi’an, China)
Jie Zhang (College of Chemistry and Chemical Engineering, Xi’an Shiyou University, Xi’an, China)
Ya Wu (College of Chemistry and Chemical Engineering, Xi’an Shiyou University, Xi’an, China)
Hong Li (College of Chemistry and Chemical Engineering, Xi’an Shiyou University, Xi’an, China)
Chentun Qu (College of Chemistry and Chemical Engineering, Xi’an Shiyou University, Xi’an, China)
Wenqi Song (College of Chemistry and Chemical Engineering, Xi’an Shiyou University, Xi’an, China)

Anti-Corrosion Methods and Materials

ISSN: 0003-5599

Article publication date: 19 March 2019

Issue publication date: 9 August 2019

Abstract

Purpose

As an example of structure-efficiency relationship study, this paper aims to evaluate the corrosion inhibition effect of two cationic surfactants, cetyl-trimethyl ammonium chloride (CTAC) and cetyl-dimethyl-hydroxyethyl ammonium chloride (CDHAC), and to discuss the effect of structure on the performance by thermodynamics methods.

Design/methodology/approach

The effect of the two cationic surfactants, CTAC and CDHAC, on the corrosion of the mild steel in HCl solution was investigated by using weight loss measurements, and the activation energies of CTAC and CDHAC involved in the corrosion inhibition were calculated and discussed.

Findings

The weight loss measurements showed that the corrosion inhibition efficiency of CDHAC was higher than that of CTAC in any case. The effects of the structure on performance were discussed, and the following data are available from the results, all of ΔS are positive, the values of ΔG are both close to −40 kJ·mol-1 and the values of ΔH are 10.960 and 36.996 kJ·mol-1, which indicate that the surfactant molecules are spontaneously adsorbed on the surface of the steel surface, and the adsorption on the steel plate is endothermic chemical adsorption.

Originality/value

The available data show that most organic inhibitors undergo physisorption on the metal surface, while in the presence of non-bonded and p-electrons, the inhibitor molecules may undergo chemisorption. This work showed that the two surfactant molecules are spontaneously adsorbed on the surface of the steel surface, and the adsorption on the steel plate is endothermic chemical adsorption.

Keywords

Acknowledgements

This work was financially supported by the grants from National Science Foundation of China (21808182) and Scientific Research Program Funded by Department of Science and Technology of Shaanxi Province (017ZDXM-SF-101).

Citation

Chen, G., Lin, J., Liu, Q., Zhang, J., Wu, Y., Li, H., Qu, C. and Song, W. (2019), "Corrosion inhibition and the structure-efficiency relationship study of two cationic surfactants", Anti-Corrosion Methods and Materials, Vol. 66 No. 4, pp. 388-393. https://doi.org/10.1108/ACMM-10-2017-1856

Publisher

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Emerald Publishing Limited

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