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Schiff base compound as a corrosion inhibitor for mild steel in 1 M HCl

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Abstract

A new Schiff base compound named 4-(4′-benzoylhydrazine)-pyridinecarboxaldehyde hydrazone (BPBH) was synthesized and investigated as a corrosion inhibitor for mild steel in 1 M HCl using weight loss measurements, electrochemical techniques, and adsorption studies. The structure of BPBH was characterized by elemental analysis, infrared spectroscopy (IR), and 1H nuclear magnetic resonance (NMR). The results clearly suggest that the compound acts as a mixed-type inhibitor of acid corrosion of mild steel. The adsorption of BPBH on the metal surface in 1 M HCl was found to agree with the Langmuir isotherm with a standard free energy of adsorption (\(\Delta G_{\text{ads}}^{0}\)) of −31.60 kJ/mol. Scanning electron microscopy images indicate that BPBH exhibits good corrosion inhibition performance for mild steel in 1 M HCl. Quantum chemical calculations were also carried out to verify the inhibition efficiencies obtained from all the experiments.

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Correspondence to Lin Zhu.

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Liu, H., Zhu, L. & Zhao, Q. Schiff base compound as a corrosion inhibitor for mild steel in 1 M HCl. Res Chem Intermed 41, 4943–4960 (2015). https://doi.org/10.1007/s11164-014-1579-8

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