Title: A derivative of chalcone as green corrosion inhibitor for copper

Abstract

Antioxidant compounds have been important in various fields. For example, they are used in medicine and biology as they protect the human body from damage caused by reactive oxygen species or free radicals. Antioxidant agents are organic compounds that contain electronegative heteroatoms and that are compatible with health and the environment, as special characteristic required by corrosion inhibitors. There are two groups known as organic antioxidant compounds: flavonoids and their precursors, the chalcones. Several studies have shown that chalcones and their derivatives have anti-inflammatory, analgesic, antitumor, repellant, and UV-protective properties. Antioxidant properties are attributed to the presence of heteroatoms such as Oxygen, Nitrogen, Sulfur, etc. Therefore, in this work, a synthesized derivative of chalcone called A2 which contain Oxygen and Fluor as electronegative heteroatoms, was studied as a corrosion inhibitor for copper in acid medium using electrochemical techniques, such as Electrochemical Impedance Spectroscopy (EIS), Pontentiodynamic Polarization Curves (PPC), Electrochemical Noise (EN), quantum chemical calculations (QCC) and adsorption isotherms (AI). The best efficiency obtained by EIS experiments was in the presence of 300 ppm of A2. PPC showed the influence of A2 over the anodic curve and its slope that was shifted to more negative potential (40mV). It was attributed to the adsorption process of the inhibitor on the double layer. Also, the efficiency from PPC was 83% at the same concentration (300 ppm). Furthermore, the EN technique over a period of 24 hours corroborated the development of a A2 layer over the metal surface. It was also confirmed by the isotherm values, where the best fit for the Langmuir model was observed with and G = -23 KJ/mol, and the results of chemical quantum calculations on the high value of softness can be related to the adsorption process of A2 on the metal surface.

Biography

María Yesenia Díaz Cárdenas is a chemical Engineer with Master and Doctorate in Engineering and Applied Sciences, graduated from Autonomous University of Morelos State, Mexico. About academic contributions, she is a professor at Technologic of Higher Studies of Coacalco, Mexico, where she teaches chemical engineering subjects and works as a project advisor of chemical engineering students. She has experience as a quality assurance inspector in pharmaceutical industry. She has a certification of Quality, Safety and Environment regulations. Regarding her scientific projects, her goals are based on apply her knowledge, experience, and skills about corrosion, electrochemistry, organic chemistry, quality assurance, statistical analysis, and natural products in developing research about studies of green antioxidant components, obtained from vegetable oils or by synthesis. The research team to which she belongs aims to develop alternatives to reduce reduce toxic corrosion inhibitors, replacing them with eco-friendly corrosion inhibitors, considering the applicable regulations and engineering quality standards.