Liliana Hernández Perales, Christiaan Jardínez, Rosa A. Vázquez García, Oscar Coreño Alonso, M. Aurora Veloz Rodríguez, Julián Cruz Borbolla, Juan Coreño Alonso, Thangarasu Pandiyan, Leticia E. Hernández Cruz, Marcos Martínez García, ?Synthesis and Mechanosynthesis of N, N?-bis (2-thyenilethyl)-2,3-butanodiimine with corrosion inhibitor properties?, Advanced Materials Research, Vol. 976 (2014) pp 64-69 (2014) Trans Tech Publications, Switzerland, doi:10.4028/www.scientific.net/AMR.976.64
In this work, we report the conventional and mechanochemical synthesis of the a-diimine derivate of 2, 3-butanedione and the primary amine 2-aminoethanethiol designated DD-DC and DD-DC/MS respectively. The products were characterized by 1H and 13C-NMR, FT-IR, MS-EI and elemental analysis. The products were also electrochemically evaluated by potentiodynamic polarization technique in order to measure their corrosion inhibition efficiency on AISI 1018 steel, immersed in a corrosive solution type NACE TM 0177. The results indicate that the compound obtained under mechanosyntesis conditions, DD-DC/MS, presents better inhibitory properties with 53% efficiency at 10 ppm concentration. On the other hand, the compound obtained by conventional synthesis (DD-DC) presented efficiency of 29% at 10 ppm concentration. Also, the DFT results show that a-diimine derivatives possesses corrosion inhibition properties, consisting of the transfer of high-charge density which in the delocalization region (N=C?C=N) is formed by p (C=N) and SH, these moiety play an important role, because their electron lone pairs help to form a protective coating to form an adsorption layer. The results showed that cysteamine compound turns out to be a good corrosion inhibitor for the steel iron surface in an acid medium forming an adsorption film over metallic surface.