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A triazole inhibitor, 3,5-di(4-hydroxyphenyl)-4-amino-1,2,4-triazole (HAT), was investigated as an anticorrosion material for carbon steel in Iraqi kerosene tanks using Tafel polarization method at (303, 313, 323, and 333 K) and (100-500 ppm) in kerosene medium. The results showed that the highest inhibition efficiency was obtained at 86.74% in 100 ppm and 333 K. The studied thermodynamic parameters show that the adsorption isotherm of the HAT inhibitor on the steel surface was identical to Langmuir isotherm. The polarization behavior revealed that this inhibitor acts as a mixed-type inhibitor, the corrosion inhibition data have been measured and discussed in details to predict the performance of the inhibitor. The morphology of the inhibited surfaces was characterized using scanning electron microscopy/energy dispersive X-ray spectroscopy (SEM/EDS) and an atomic force microscope (AFM). Furthermore, the Fourier transform infrared (FT-IR) technique was used to show the interaction between HAT and the steel surface. Also, the antimicrobial activity of HAT inhibitor against some types of corrosive bacteria was examined. In addition, quantum chemical parameters were calculated by density functional theory to reveal the active centers of the inhibitor and clarify the correlation of molecular structure of the inhibitor and its efficiency of the inhibition.

No abstract

The investigation on the efficiency of three organic derivatives was done as inhibitors for carbon steel using electrochemical methods at four temperatures (303, 313, 323, and 333 K) and 100 ppm. The results showed that these prepared compounds gave good efficiencies at experimental conditions by adsorption process and they act as mixed-type inhibitor, the data of corrosion were measured and debated. Using SEM, the inhibited surface of specimens was characterized. In addition, for display the interaction between these compounds and the metallic surface, the Fourier transform infrared spectra was used. In addition, the activity of antibacterial of the inhibitors against some types of bacteria was tested.