Experimental and theoretical study on the corrosion inhibition of API 5L X52 steel in acid media by a new quinazoline derivative

• Published in: Journal of molecular liquids 2020-12, Vol.320, p.114449, Article 114449
• Main Authors: Aldana-González, J., Cervantes-Cuevas, H., Alfaro-Romo, C., Rodriguez-Clemente, E., Uruchurtu-Chavarin, J., Romero-Romo, M., de Oca-Yemha, M.G. Montes, Morales-Gil, P., Mendoza-Huizar, L.H., Palomar-Pardavé, M.
• Format: Article
• Language: English
• Subjects: Corrosion inhibition; Exposure time; Hydrodynamic conditions; Steel; Temperature
• ISSN: 0167-7322; 1873-3166
• DOI: 10.1016/j.molliq.2020.114449

For the first time, the synthesis, characterization, and electrochemical assessment as corrosion inhibitor of steel API 5L X52 immersed in 0.5 M HCl of the molecule 2-bromo-6(2′,6′-dichlorophenyl) dihydrobenzo [4, 5] imidazo [1,2c] quinazoline, 2Br2′,6′diClDHBIQz is reported. To evaluate the corrosion inhibition efficiency, IE, of this synthesized compound the following were assessed: inhibitor concentration, temperature, hydrodynamic conditions and steel exposure time to the corrosive medium. At 25 °C, EIS indicated the IE increased to 92.7% having added 15 ppm (0.03 mM) concentration, remaining practically constant (91.9 ± 0.78) % in the whole electrode angular speeds range considered; IE values higher than 85%, were attained even after 280 h acid exposure in stagnant conditions. SEM and AFM images revealed the steel-protective capacity of 2Br2′,6′diClDHBIQz while XPS analysis proved its presence onto the steel surfaces. The theoretical results are in complete agreement with the experimental XPS analyses. [Display omitted] •New steel corrosion inhibitor, 2Br2′,6′diClDHBIQz, was synthesized and characterized.•Concentration, temperature, hydrodynamic conditions and exposure time were evaluated.•From EIS it was found that the inhibition efficiency was >85%, even after 280 h.•Steel surface characterization in absence and presence of inhibitor was done by SEM, AFM and XPS.•The theoretical, DFT, results are in complete agreement with the experimental ones.