Experimental and Theoretical Studies on Inhibition of Carbon Steel Corrosion by 1,5-Diaminonaphthalene
The aim of this study is to investigate the inhibition efficiency of 1,5-diaminonaphthalene (NDA), for mild steel corrosion in 1 M HCl solution. For this purpose, weight loss, electrochemical impedance spectroscopy and potentiodynamic measurements were realized. The effect of NDA on the mild steel corrosion was also studied by quantum chemical calculations. Increasing inhibitor concentration led to significant reduction in the corrosion rate of mild steel, with inhibitor efficiency value above 90%. The corrosion behavior of steel in 1 M HCl without and with the inhibitor at various concentrations was studied at the temperature range of 308–348 K. Potentiodynamic polarization showed that the inhibitor acts as mixed type. The Nyquist plots showed that increasing NDA concentration, polarization resistance increased and double-layer capacitance decreased, involving increased inhibition efficiency. The adsorption of NDA on the mild steel surface was well described by the Langmuir adsorption model. In addition, quantum chemical calculations based on density function theory and molecular dynamic simulations are done to support the accuracy of experimental results.
KeywordsMild steel Acid medium Corrosion inhibition Molecular dynamic Electrochemical techniques DFT
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Conflict of interest
On behalf of all authors, the corresponding author states that there is no conflict of interest.
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