Corrosion Protection of Mild Steel by a New Phosphonated Pyridines Inhibitor System in HCl Solution

Lilia Tabti (1) , Redha Khelladi (1) , Nadjib Chafai , Alexandre Lecointre (2) , Aline Nonat (2) , Loic Charbonnière (2) , Embarek Bentouhami (1)

1 UFAS1 - Université Ferhat-Abbas Sétif 1 [Sétif]
2 DSA-IPHC - Département Sciences Analytiques et Interactions Ioniques et Biomoléculaires

The adsorption behavior and inhibition mechanism of (1, 4, 7-Tris [hydrogen (6-methylpyridin-2-yl) phosphonate] -1, 4, 7-triazacyclononane) (TPP) on the corrosion of mild steel in 1 M HCl were investigated by weight loss technique, potentiodynamic polarization, and electrochemical impedance spectroscopy (EIS) methods for different concentrations at 25°C. The results show that the inhibition efficiency values depend on the amount of immersion times and the concentration. A 90% efficiency is found at the highest concentration of the studied compound according to weight loss measurements. The adsorption of the investigated inhibitor on the mild steel surface was well supported using an AFM study. For the assignment of the absorption sites, we performed quantum chemical calculations with (DFT) method. The interaction between the inhibitor and iron surface were performed by molecular dynamic (MD) simulations. In this paper, experimental methods and results used to assess the efficiency of the studied compound are presented.

Mots clés: Phosphonated Pyridines; TPP; Inhibitor; Cyclic voltammetry; DFT calculations

Domaines: Matériaux; Chimie théorique et/ou physique

Lilia Tabti, Redha Khelladi, Nadjib Chafai, Alexandre Lecointre, Aline Nonat, et al.. Corrosion Protection of Mild Steel by a New Phosphonated Pyridines Inhibitor System in HCl Solution. Advanced Engineering Forum, 2020, 36, pp.59-75. ⟨10.4028/www.scientific.net/AEF.36.59⟩. ⟨hal-02965473⟩