Synthesis of dicationic surfactants containing a long chain in one of the two pyridinium nitrogen in the structure and investigation of their anticorrosion properties

Abstract

In this study, five surfactants containing two pyridinium groups and one of which has a carbon chain of different lengths were synthesized in order to counteract the corrosion that occurs more rapidly on the metal surface in acidic environment. By using spectroscopic methods (FT-IR and NMR), the products' chemical structures were verified. Gravimetric measurements were then applied to assess how well they resisted metal corrosion. The experiment involved immersing metal plates in 1.0 M HCl solutions with varying inhibitor concentrations for a day at room temperature. The weight loss of each plate was then measured. By utilizing these weight losses, both corrosion rate and corrosion inhibition efficiency were calculated. As a result of the calculations, it was realized that their ability to inhibit metal corrosion gradually increased due to the decrease in corrosion rates as the long carbon chain in their structure increased. However, in order to determine the type of adsorption on the metal surface, which is a factor directly affecting their corrosion inhibition, a Langmuir adsorption isotherm study was performed, which was found to be compatible. In order to visually support that they protect the metal surface against corrosion, 1600-fold magnified surface images of the metal surfaces removed from the corrosion test were taken with an optical microscope camera.