The novel polythiadiazole polymer and its composite with a-Al(OH)3 as inhibitors for steel alloy corrosion in molar H2SO4: Experimental and computational evaluations

다국어 초록 (Multilingual Abstract)

Polymer/composite materials have been commonly used as corrosion inhibitors in different fields such asmarine, oil field, and engineering industry due to their self-healing and thermal stability features. Herein,novel polythiadiazole, namely poly[(2,6-dicarbonylpyridine)(2,5-dihydrazinyl-1,3,4-thiadiazole)] (AMTP)via the interaction of 2,5-dihydrazinyl-1,3,4-thiadiazole with pyridine-2,6-dicarbonyl dichloride and itscomposite with a-Al(OH)3-gel were designed in a good yield. The structures of the fabricated materialsare characterized by FT-IR, NMR, SEM, and UV–Vis analyses. The protective action of AMTP and a-Al(OH)3@AMTP on the C1018-steel corrosion in molar-sulphuric acid was evaluated by potentiodynamicpolarization(PDP) and electrochemical impedance spectroscopic (EIS) methods. PDP findings presentedthat the AMTP polymer and a-Al(OH)3@AMTP composite performed as mixed-type inhibitors. The protectioncapacities of 90.3 and 97.6% were obtained in the presence of optimum dose 100 mg/L ofAMTP polymer and a-Al(OH)3@AMTP composite, respectively. The compound’s adsorption on C1018-steel follows the Langmuir isotherm model. The SEM/EDX outcomes reveal that the C1018-steel interfaceis inhibited by AMTP polymer and a-Al(OH)3@AMTP composite. DFT calculations exhibited that the efficiencyof the prepared materials correlates well with their electron contributing capability, whereas simulationsof Monte Carlo exposed that the favorability and extent of adsorption of additive moleculesmetal interface establish their corrosion protection routines.

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