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

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.