article · Arabian Journal of Chemistry
Three novel triazole Schiff base derivatives, designated as TMN, FTA, and TTA, were synthesised using ultrasonic irradiation to test their effectiveness as corrosion inhibitors. Their chemical structures were verified through analytical techniques including spectroscopy and elemental analysis. Laboratory evaluations examined the protective performance of these compounds on carbon steel exposed to a one molar hydrochloric acid environment. Electrochemical testing methods, including electrochemical frequency modulation, electrochemical impedance spectroscopy, and potentiodynamic polarisation, revealed that all three substances act as mixed-type corrosion inhibitors. Protective efficiency improved with higher concentrations, reaching peak values at one millimole per litre. At this concentration, TMN achieved the highest inhibition efficiency at over ninety-one per cent, followed by TTA and FTA at approximately eighty-eight and eighty-seven per cent respectively. Computational analyses using density functional theory corroborated the experimental electrochemical measurements.
Industrial steel structures and piping frequently degrade when exposed to acidic conditions, such as hydrochloric acid cleaning solutions. Finding effective chemical additives can substantially reduce metal loss and maintenance costs. Demonstrating that triazole Schiff base derivatives can prevent nearly ninety-two per cent of carbon steel corrosion provides industrial chemists with clear evidence for designing targeted protective chemical treatments.
This work points towards potential applications in industrial acid pickling, oilfield acidising, or metal cleaning where carbon steel requires chemical protection. Potential users include specialty chemical manufacturers and corrosion service providers. Because the evidence is restricted to laboratory-scale electrochemical assays and computational simulations, the technology remains at an early stage of research and requires extensive formulation, safety, and operational testing before commercial adoption.
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In this work, three triazole Schiff base derivatives 1-((1H-1,2,4-triazol-3-ylimino)methyl)naphthalen-2-ol (TMN), N-(furan-2-ylmethylene)-1H-1,2,4-triazol-3-amine (FTA) and N-(thiophen-2-ylmethylene)-1H-1,2,4-triazol-3-amine (TTA) were synthesized under ultrasonic irradiation and were investigated as corrosion inhibitors. FT-IR, NMR, and elemental analysis were used to elucidate the chemical structure of the synthesized inhibitors. The inhibitive characteristics of these inhibitors on C-steel corrosion in 1.0 M HCl were studied using three different techniques. The applied techniques were Electrochemical frequency modulation, electrochemical impedance spectroscopy, and potentiodynamic polarization curves. The acquired data from the experimental methods showed that the optimal concentration for TMN, FTA, and TTA is 1.0 × 10−3 mol/L, and the inhibition efficiency reached up to 91.68%, 88.44%, and 87.29% for TMN, TTA, and FTA, respectively. Experiments also indicated that these compounds act as mixed-type inhibitors, and their concentration affects the inhibition efficiency in a directly proportional manner. Quantum paraments obtained from density functional theory (DFT) showed good agreement between experimental and computational results.
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DOI: 10.1016/j.arabjc.2021.103491
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