Synthesis and characterization of triazol derivative as new corrosion inhibitor for mild steel in 1M HCl solution complemented with antibacterial studies

Abstract

One of the most serious problems in the industry in which mild steel is used is corrosion. Billions of dollars are lost every year due to corrosion problems, especially in industries that use acids, especially hydrochloric acid, where hydrochloric acid has an important role in industrial processes, in refining crude oil, pickling acid, industrial cleaning, acid sizing, and in petrochemical processes. New inhibitor derived from triazole namely “methyl 2-(1-(5-methyl-1-(p-tolyl)-1H-1,2,3-triazol-4-yl)ethylidene)hydrazinecarbodithioate” (MTH) has been synthesized and fully characterized by Fourier transformer infra-red (FT-IR) and Nuclear Magnetic Resonance (NMR) spectroscopically techniques in addition to CHN analysis. The new compound has been tested as new corrosion inhibitor for mild steel in hydrochloric acid solution. The inhibition performance of new corrosion inhibitor was investigated by weight loss method. Results demonstrate that the corrosion rate (CR) decreased significantly in the presence MTH. On the other hand, the inhibition efficiency, increased with the increase of the concentration of MTH up to 95.1% achieved at 303 K for a 0.5mM concentration. The inhibition efficiency decreases with temperature increase. The antimicrobial activities of MTH for Escherichia coli and Staphylococcus aureus have been investigated. The results revealed that the MTH has satisfactory activities against the tested bacteria. The corrosion of mild steel is one of the most serious problems in the industry. Billions of dollars are lost every year due to the corrosion problems, especially in industries that use acids such as especially hydrochloric acid, where it has an important role in industrial processes, in refining crude oil, pickling acid, industrial cleaning, acid sizing, and in petrochemical processes. New inhibitor derived from triazole namely “methyl 2-(1-(5-methyl-1-(p-tolyl)-1H-1,2,3-triazol-4-yl) ethylidene) hydrazinecarbodithioate” (MTH) has been synthesized and fully characterized by Fourier Transformer Infra-Red (FT-IR) and Nuclear Magnetic Resonance (NMR) as a spectroscopic technique. In addition to CHN analysis. The new compound has been tested as a new corrosion inhibitor for mild steel in hydrochloric acid solution. The inhibition performance of new corrosion inhibitor was studied by weight loss method. The results demonstrates that the corrosion rate (CR) decreased significantly in the presence of an MTH. On the other hand, the inhibition efficiency was increased with the increase in the concentration of MTH up to 95.1% achieved at a temperature of 303 °K for a concentration of 0.5mM. The inhibition efficiency was decreases with increasing temperature. The antimicrobial activities of MTH for E. coli and S. aureus have been investigated. The results revealed that the MTH has satisfactory activities against the tested bacteria.