Corrosion inhibition performance of copper using N-benzylhy-drazinecarbothioamide in a 3.5 % NaCl solution: Original scientific paper

Arafat Toghan; Hanan Alhussain; Azza Attia; Omar K. Alduaij; Ahmed Fawzy; Ahmed M. Eldesoky; Ahmed Farag

doi:10.5599/jese.2181

Authors

Arafat Toghan Chemistry Department, Faculty of Science, South Valley University, Qena 83523, Egypt https://orcid.org/0000-0002-1423-1147
Hanan Alhussain Chemistry Department, College of Science, Imam Mohammad Ibn Saud Islamic University (IMSIU), Riyadh 11623, Saudi Arabia https://orcid.org/0000-0003-2660-4462
Azza Attia Chemistry Department, Faculty of Science and Arts, Najran University, Najran, Saudi Arabia https://orcid.org/0009-0003-8247-6909
Omar K. Alduaij Chemistry Department, College of Science, Imam Mohammad Ibn Saud Islamic University (IMSIU), Riyadh 11623, Saudi Arabia https://orcid.org/0000-0001-6290-2892
Ahmed Fawzy Department of Chemistry, Faculty of Science, Assiut University, Egypt https://orcid.org/0000-0002-0668-8972
Ahmed M. Eldesoky Department of Chemistry, University College in Al-Qunfudhah 21912, Umm Al-Qura University, Saudi Arabia https://orcid.org/0000-0002-2668-9710
Ahmed Farag Egyptian Petroleum Research Institute (EPRI), Cairo 11727, Egypt https://orcid.org/0000-0002-9019-5635

DOI:

https://doi.org/10.5599/jese.2181

Keywords:

Copper corrosion, aqueous NaCl, organic inhibitor, adsorption

Abstract

In this report, N-benzylhydrazinecarbothioamide (BHCTA) was investigated as an organic inhibitor for the corrosion of copper substrate in 3.5 wt.% sodium chloride electrolyte at 298 K. The inhibition efficiency of BHCTA was examined using electrochemical, chemical and theoretical tools. The gained outcomes indicated a supreme inhibition efficiency of BHCTA which exceeded 95 % upon addition of 1.00 mM of BHCTA. Such supreme efficiency was discussed on the basis of decisive adsorption of BHCTA molecules on the copper substrate that hinders concurrently the anodic oxidation and cathodic reduction reactions progressions. The adsorption of BHCTA on the copper surface was discovered to obey Langmuir isotherm. The resulting value of DG_ads⁰ = −35.7 kJ mol⁻¹indicates that BHCTA molecules adsorb on the copper surface through a spontaneous mix of physisorption and chemisorption processes. A scanning electron microscope was used to examine the effect of BHCTA adsorption on the morphology of the copper surface. Theoretical calculations showed that BHCTA has good adsorption properties on Cu substrate. There is a good consistency between the applied experimental and theoretical tools, confirming the validity of the gained outcomes.

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Corrosion inhibition performance of copper using N-benzylhy-drazinecarbothioamide in a 3.5 % NaCl solution

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