Abstract:

Corrosion is a type of deterioration found mainly in metal structures. Metals that compose these structures oxidize when they come into contact with substances with high reduction potential, therefore care requires to prevent these reactions. The corrosion products cause negative changes in metal alloys properties as mechanical strength, aesthetics, ductility, elasticity, among others. Reversing the corrosion process is extremely expensive, making prevention the best way to solve this problem. Researchers conducted to minimize the corrosion phenomena in copper, iron and other metal alloys, several classes of organic compounds such as indole, azoles, thiazoles, oxazolidines, ammonium salts, and others were tested and have demonstrated a good anticorrosion activity profile. These compounds exhibit this anticcorrosive activity due to the presence of π electrons and/or atoms which have non binding electron pair (O, N, S, and others), causing a phenomenon of adsorption and thus creating a protective film on the metal surface. Depending on the structure of the molecule and the functional groups present, there may be two types of sorption: physisorption or chemisorption, the latter involving coordination with the metal, and therefore better adsorption efficiency. Because of the economic importance in obtaining substances with potential anticorrosion activity, we propose the synthesis of cinnamic acid thiourea derivatives, in order to obtain a high efficiency corrosion inhibitor that could be at the same time easy to obtain and have low production cost.