Abstract:
The influence of three naphthyridines (NTDs) on acidic dissolution of mild steel was evaluated using experimental methods. Protection abilities of the NTDs molecules are increases with their concentrations. Maximum
inhibition efficiency of 98.69% was observed for NTD-3 molecule at its 4.11 × 10−5 mol/L−1 concentration. The
inhibition efficiencies of NTDs molecules followed the order: NTD-1 (96.1%) < NTD-2 (97.4%) < NTD-3
(98.7%). Polarization study showed that NTDs acted as mixed type inhibitors and they preferably block the
active sites accountable for the corrosion. EIS study suggested that the NTDs inhibit corrosion because of their
adsorption at electrolyte/metal interfaces and their adsorption followed Langmuir adsorption isotherm. AFM
analysis was adopted to support the adsorption inhibitive behavior of NTDs.
