2-Amino-4-(2,4-dihydroxyphenyl) quinoline-3-carbonitrile as sustainable corrosion inhibitor for {SAE} 1006 steel in 1 M HCl: Electrochemical and surface investigation
By Verma, Chandrabhan; Quraishi, M. A.
Published in Journal of the Association of Arab Universities for Basic and Applied Sciences
2016
Abstract
Abstract The corrosion inhibition efficiency of 2-amino-4-(2,4-dihydroxyphenyl) quinoline-3-carbonitrile (ADQC) on {SAE} 1006 steel has been investigated using electrochemical (EIS and Polarization), surface (SEM, {EDX} and AFM) and quantum chemical calculation methods. Results showed that inhibition efficiency increases with increasing {ADQC} concentration and maximum value of 96.12% was obtained at 25 mg/L concentration. {EIS} results showed the {ADQC} inhibits {SAE} 1006 steel corrosion becoming the adsorbate at metal/electrolyte interfaces. Polarization study showed that {ADQC} acts as cathodic type inhibitor. SEM, {EDX} and {AFM} finding supported the adsorption of {ADQC} on the mild steel surface. The quantum chemical calculations provide good insight about the adsorption and inhibition mechanism of ADQC. The experimental and quantum chemical calculation results were in good agreement.