Corrosion Inhibition of Mild Steel in Hydrochloric Acid Environment Using Terephthaldehyde Based on Schiff Base: Gravimetric, Thermodynamic, and Computational Studies
Bahaa Sami Mahdi,
Muna Khethier Abbass,
Mustafa Khudhair Mohsin,
Waleed Khalid Al-azzawi,
Mahdi M. Hanoon,
Mohammed Hliyil Hafiz Al-kaabi,
Lina M. Shaker,
Ahmed A. Al-amiery,
Wan Nor Roslam Wan Isahak,
Abdul Amir H. Kadhum,
Mohd S. Takriff
Affiliations
Bahaa Sami Mahdi
Production Engineering and Metallurgy, University of Technology-Iraq, Baghdad 10001, Iraq
Muna Khethier Abbass
Production Engineering and Metallurgy, University of Technology-Iraq, Baghdad 10001, Iraq
Mustafa Khudhair Mohsin
The Supreme National Authority for Accountability and Justice, Baghdad 10001, Iraq
Waleed Khalid Al-azzawi
Department of Medical Instruments Engineering Techniques, Al-Farahidi University, Baghdad 10001, Iraq
Mahdi M. Hanoon
Production Engineering and Metallurgy, University of Technology-Iraq, Baghdad 10001, Iraq
Mohammed Hliyil Hafiz Al-kaabi
College of Industrial Management of Oil and Gas, Basrah University of Oil and Gas, Basrah 61001, Iraq
Lina M. Shaker
Department of Chemical and Process Engineering, Faculty of Engineering and Built Environment, Universiti Kebangsaan Malaysia (UKM), Bangi P.O. Box 43000, Malaysia
Ahmed A. Al-amiery
Department of Chemical and Process Engineering, Faculty of Engineering and Built Environment, Universiti Kebangsaan Malaysia (UKM), Bangi P.O. Box 43000, Malaysia
Wan Nor Roslam Wan Isahak
Department of Chemical and Process Engineering, Faculty of Engineering and Built Environment, Universiti Kebangsaan Malaysia (UKM), Bangi P.O. Box 43000, Malaysia
Abdul Amir H. Kadhum
Faculty of Medicine, University of Al-Ameed, Karbala 56001, Iraq
Mohd S. Takriff
Chemical and Water Desalination Engineering Program, Department of Mechanical & Nuclear Engineering, College of Engineering, University of Sharjah, Sharjah 26666, United Arab Emirates
Using traditional weight-loss tests, as well as different electrochemical techniques (potentiodynamic polarization and electrochemical impedance spectroscopy), we investigated the corrosion-inhibition performance of 2,2′-(1,4-phenylenebis(methanylylidene)) bis(N-(3-methoxyphenyl) hydrazinecarbothioamide) (PMBMH) as an inhibitor for mild steel in a 1 M hydrochloric acid solution. The maximum protection efficacy of 0.0005 M of PMBMH was 95%. Due to the creation of a protective adsorption layer instead of the adsorbed H2O molecules and acidic chloride ions, the existence of the investigated inhibitor reduced the corrosion rate and increased the inhibitory efficacy. The inhibition efficiency increased as the inhibitor concentration increased, but it decreased as the temperature increased. The PMBMH adsorption mode followed the Langmuir adsorption isotherm, with high adsorption-inhibition activity. Furthermore, the value of the ∆Gadso indicated that PMBMH contributed to the physical and chemical adsorption onto the mild-steel surface. Moreover, density functional theory (DFT) helped in the calculation of the quantum chemical parameters for finding the correlation between the inhibition activity and the molecular structure. The experimental and theoretical findings in this investigation are in good agreement.
