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Electrochemical Studies on Corrosion Inhibition Behaviour of Synthesised 2-acetylpyridine 4-ethyl-3-thiosemicarbazone and Its Tin(IV) Complex for Mild Steel in 1 M HCl Solution

  • Received : 2018.07.05
  • Accepted : 2018.09.03
  • Published : 2019.03.31

Abstract

Corrosion inhibition by synthesised ligand, 2-acetylpyridine 4-ethyl-3-thiosemicarbazone (HAcETSc) and its tin(IV) complex, dichlorobutyltin(IV) 2-acetylpyridine 4-ethyl-3-thiosemicarbazone ($Sn(HAcETSc)BuCl_2$) on mild steel in 1 M hydrochloric acid (HCl) was studied using weight loss measurement, potentiodynamic polarisation, electrochemical impedance spectroscopy (EIS), and scanning electron microscopy (SEM). The inhibition efficiency increases by increasing the inhibitor concentrations. The polarisation study showed that both synthesised compounds were mixed type inhibitors. The electrochemical impedance study showed that the presence of inhibitors caused the charge transfer resistance to increase as the concentration of inhibitors increased. The adsorption of these compounds on mild steel surface was found to obey Langmuir's adsorption isotherm with the free energy of adsorption ${\Delta}G{^o}_{ads}$ of -3.7 kJ/mol and -7.7 kJ/mol for ligand and complex respectively, indicating physisorption interaction between the inhibitors and 1 M HCl solution.

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Fig. 1. Inhibition efficiency of HAcETSc and Sn(HAcETSc)BuCl2.

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Fig. 2 Tafel plots of mild steel with various concentrations of (a) HAcETSc and (b) Sn(HAcETSc)BuCl2

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Fig. 3. Nyquist diagram for mild steel immersed for ten minutes in various concentrations of HAcETSc and Sn(HAcETSc)BuCl2.

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Fig. 4. Electric equivalent circuit of the metal / inhibitors / HCl.

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Fig. 5 SEM images of (a) uninhibited mild steel [blank] (b) mild steel inhibited with HAcETSc, and (c) mild steel inhibited with Sn(HAcETSc)BuCl2.

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Fig. 6. Langmuir isotherm for the adsorption of both inhibitors.

Table 1 Inhibitors under investigation

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Table 2 Corrosion inhibition data by weight loss method

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Table 3. Polarisation parameter values.

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Table 4. Impedance parameter values.

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Acknowledgement

Supported by : Ministry of Higher Education

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