Corrosion inhibition performance of a structurally well-defined 1,2,3-triazole derivative on mild steel-hydrochloric acid interface

Meryem Hrimla^a,⁎, Lahoucine Bahsis^a,b, Aziz Boutouil^a, My Rachid Laamari^a,⁎, Miguel Julve^c, Salah-Eddine Stiriba^a,c,⁎.

^a Laboratoire de Chimie Analytique et Moléculaire /LCAM, Université Cadi Ayyad, Faculté Polydisciplinaire de Safi, Sidi Bouzid. B.P. 4162, 46 000 Safi, Morocco
^b Département de Chimie, Faculté des Sciences d'El Jadida, Université Chouaïb Doukkali, B.P.:20, El Jadida 24000, Morocco
^c Instituto de Ciencia Molecular/ICMol, Universidad de Valencia, C/Catedrático José Beltrán 2, 46980, Valencia, spain.

⁎ Corresponding authors:
E-mail addresses: r.laamari@gmail.com (M.R. Laamari); stiriba@uv.es (S-E Stiriba); meryemhrimla.uca@gmail.com (M. Hrimla).

Abstract

The study of the corrosion inhibition of mild steel using organic inhibitors, mainly in an acid environment, is one of the main current research topics in the steel industry [1]. In this context, 1,2,3-triazoles are N-heterocyclic compounds containing a five-membered ring with three nitrogen atoms. Their derivatives are used in a wide variety of applications ranging from biology and pharmaceuticals to the development of large quantities used as corrosion inhibitors [2]; this minimizes the corrosion of metals and alloys, which is a serious problem worldwide [3]. The use of these additives is a significant advance due to their economical synthesis route and high inhibitory efficiency, as well as the presence of electron donors such as oxygen (O), nitrogen (N), sulfur (S) atoms, and conjugated groups in its structure to act as powerful inhibitors for the prevention of corrosion of metals by acids [4]. In the present work, the inhibition performance of the new flexible multidentate 1,2,3-triazole compound, namely 4-[1-(4-Methoxy-phenyl)-1H-[1,2,3]triazol-4-ylmethyl]-morpholine (MPTM) synthesized under the click chemistry strategy using the copper-catalyzed azide-alkyne cycloaddition reaction (CuAAC). Its inhibitory effect was studied using a range of electrochemical methods such as potentiodynamic polarization (PDP), electrochemical impedance spectroscopy (EIS) methods, and weight loss measurements. Also, to take into account the adsorption phenomenon of MPTM, the adsorption models of the reference compound were tested during the corrosion prevention process using Freundlich, Langmuir, and Temkin methodologies. Theoretical studies were used to rationalize the adsorption mechanism of the MPTM compound on the surface of mild steel.

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