Thermodynamic and Adsorption Studies on the Corrosion Inhibition of Zn by 2, 2'-Dithiobis(2,3-dihydro-1,3-benzothiazole) in HCl Solutions

El Wanees, S; Bukhari, Abeer Abdulaziz H.; Alatawi, Naifa S.; Salem, S.; Nooh, S; Mustafa, Syed Khalid; Elyan, S. S.

doi:10.21608/ejchem.2020.42128.2849

Thermodynamic and Adsorption Studies on the Corrosion Inhibition of Zn by 2, 2'-Dithiobis(2,3-dihydro-1,3-benzothiazole) in HCl Solutions

Document Type : Original Article

Authors

¹ Faculty College of Umlij, University of Tabuk, Umlij, Tabuk, Saudi Arabia

² Chemistry Department, Faculty of Science, Zagazig University, Zagazig 44519, Egypt

³ Department of Chemistry, Faculty of Science, University of Tabuk, Tabuk 71421, Saudi Arabia

⁴ Physics Department, Faculty of Science, University of Tabuk, Tabuk 71421, KSA

⁵ Chemistry Department, Faculty of Pharmacy, Badr University, Badr, Egypt

10.21608/ejchem.2020.42128.2849

Abstract

The thermodynamics parameters and adsorption mechanism of the 2,2'-dithiobis(2,3-dihydro-1,3-benzothiazole), DDBT, as a corrosion retarder for Zn in 0.5 M HCl solution were studied by different techniques. Potentiodynamic polarization, thermometric and Gravimetric techinques, as well as, SEM surface investigations were employed. The data of different techniques were compatible and confirmed the inhibition effect of DDBT. The potentiodynamic polarization data disclosed that the DTDBT molecules behave as a mixed-kind inhibitor. The different thermodynamic parameters about the corrosion and adsorption processes were deduced to suggest the inhibition mechanism. The DDBT molecules are adsorbed on the C-steel surface confirming the Langmuir isotherm obeying a mixed mechanism (physical and chemisorption).

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