A new azomethine compound viz. 3-(2-amino-4,5-dimethylphenyl)imino)methyl) benzaldehyde (ADMB) was synthesized following a greener approach at room temperature and its anti-corrosion characteristics for mild steel (MS) corrosion were examined at various temperatures (298 K to 328 K) and concentrations (1 mM to 0.001 mM) in 0.5 M H2SO4 via electrochemical methods allied with surface characterization techniques. The adsorption of the ADMB molecules on the metal surface follows Langmuir's adsorption isotherm. To ascertain the mode of adsorption process, various adsorption and activation parameters were evaluated. Surface characterization studies viz. ATR-FTIR, SEM, AFM and EDS depict the formation of protective layer of ADMB on MS specimen. Density functional theory (DFT) treatment of ADMB established that the lower energy gap (ΔE) between the highest occupied molecular orbital (HOMO) and the lowest unoccupied molecular orbital (LUMO) resulted in significantly high inhibition efficiency. These results have shown that ADMB act as an effective inhibitor for MS corrosion in H2SO4. The inhibition efficiencies predicted from experimental measurements are in agreement with the theoretically evaluated parameters and results of spectroscopic techniques.
Bibliographical noteFunding Information:
This work was supported by Korea Institute of Energy Technology Evaluation and Planning ( KETEP ) ( 20162010103990 ) grant funded by the Korean Ministry of Trade, Industry and Energy. The authors would also like to acknowledge the financial support provided from UGC -Major Research Project ( 42-319/2013, SR ) and the research facilities provided by the Department of Chemistry and the University Science Instrumentation Centre (USIC), University of Delhi, India.
All Science Journal Classification (ASJC) codes
- Electronic, Optical and Magnetic Materials
- Atomic and Molecular Physics, and Optics
- Condensed Matter Physics
- Physical and Theoretical Chemistry
- Materials Chemistry