Synergistic effect of antibiotics on the inhibition property of aminothiazolyl coumarin for corrosion of mild steel in 0.5 M H2SO4

Synergistic effect of the environment friendly fluoroquinolones (FQs) on inhibition nature of the 3-(2-((4-hydroxybenzylidene)amino)thiazole-4-yl)-2H-chromen-2-one (HBATC) for the corrosion of mild steel in 0.5 M H2SO4 was studied using weight loss and electrochemical studies. 2 mM of HBATC and different concentrations such as 0.04, 0.08 and 0.12 mM of FQs were used to study the synergistic effect. Comparison of the inhibition efficiency of individual HBATC and mixture of HBATC and FQs, the effect of FQs on the increase of % IE appeared to be synergistic in nature. Polarization study revealed that mode of inhibition was mixed type and the formation of protective layer was confirmed by surface morphological studies like FT-IR and SEM-EDS. A suitable mechanism for corrosion inhibition was proposed based on the results obtained from weight loss and electrochemical studies. (C) 2019 Elsevier B.V. All rights reserved.