Akademik Veri Yönetim Sistemi
6th. International African Conference on Current Studies of Science, Technology & Social Sciences, Tarabulus, Libya, 10 - 11 Şubat 2023, ss.226-238
One of the important problems known to the metal industry is that metal structures lose their properties and strength as a result of the deformation of their surfaces. The most important factor causing this situation is the corrosion of metal surfaces due to environmental effects. One of the most convenient methods against corrosion of the metal surface, which occurs more rapidly, especially in acidic environments, is to use a corrosion inhibitor. In recent years, based on the increased effectiveness of cationic surfactants as corrosion inhibitors against metal corrosion in acidic environments, in this study, tri-cationic surfactants were synthesized to investigate the anticorrosion effects on metal surfaces in 1.0 M HCl medium. The chemical structures of the synthesized inhibitors were proven by spectroscopic (FT-IR and NMR) methods. The inhibitory activities of surfactants containing 14 to 16 carbon atoms in the long chain, whose structures were elucidated, were determined against the corrosion of mild steel by using the weight loss method in 1.0 M HCl medium. As a result of corrosion tests performed by immersing metal coupons in 1.0 M HCl solutions with different inhibitor concentrations (10, 25, 50, 100 and 250 ppm) for 24 hours at room temperature, close and high inhibitory efficiencies (97.09 – 97.96%) were obtained for both surfactants. Although the inhibition efficiency results of both compounds were close to each other, it was determined that the surfactant containing 14 carbon atoms in its long chain showed better protection at each inhibitor concentration studied than the other one containing 16 carbon atoms. In addition to the corrosion tests performed by the weight loss method, some physicochemical parameters such as the critical micelle concentration, surface tensions at this concentration, and free energy of micelle formation were calculated for the tri-cationic surfactants. In order to show that surfactants adsorb on the metal surface and protect the surface from corrosion, surface images were taken by scanning electron microscope (SEM) and the roughness of the metal surfaces immersed in the acid solution was determined.