Aluminium alloy corrosion prevention in 1M HCl via novel 1,2,3-triazole-aromatic acetamide molecular conjugates: Effect of the substituent and DFT study

Abstract

In this work, an efficient click elaboration of three 1,2,3-triazole-acetamide molecular hybrids as promising corrosion inhibitors was synthesized through the Cu(I) azide alkyne cycloaddition approach (CuAAC) of the focused 1,1-diphenylprop-2-yn-1-ol with some specific phenylacetamide azides. To accurately characterize the click products HTPs, several NMR-spectroscopic approaches were used, including ¹H and ¹³C NMR as well as CHN analysis. The novel developed products were investigated for their corrosion efficiency for aluminium alloy (Al alloy) in 1M HCl using chemical, electrochemical, surface analysis and density functional theory method. The corrosion studies reveal in presence of triazole-acetamide derivative obtained a maximum 85 % inhibition efficiency. The investigated HTPs compound act as predominant cathodic corrosion inhibitor. FTIR, SEM and EDX results support the creation of a layer of protection on the surface of the metal. DFT results supported the experimental results, reveals that the presence of substituent on benzene ring: fluorine atom decreases corrosion inhibition, whereas nitro group increases the corrosion inhibition performance of 1,2,3-triazole-acetamide.