Comparative Study of Synergistic Inhibition of Mild Steel and Pure Iron by 1-Hexadecylpyridinium chloride and Bromide Ions

By Saleh, M. M.; Mahmoud, Manal G.; El-Lateef, Hany M. Abd
Published in Corrosion Science 2019

Abstract

The comparison of the corrosion behavior of mild steel (MS) and pure iron (PI), and synergistic action of 1-Hexadecylpyridinium chloride (HDPCl) and Br- ion are studied in 0.5 M sulphuric acid solution. The study was carried out using open-circuit potential, potentiodynamic polarization, and electrochemical impedance spectroscopy measurements. In absence of inhibitor (blank), the corrosion rate of mild steel is greater than that of pure iron. In presence of HDPCl only, the inhibition efficiency for MS corrosion in H2SO4 is higher than that of PI and attributed to the different surface charges on both MS and PI in H2SO4 solution. The obtained results indicate that the inhibition efficiency (?i%) of HDPCl is significantly increased in the presence of Br- ions for both MS and PI. In the presence of the Br- ions, the ?i increases significantly at relatively low concentrations of HDPCl ([HDPCl] = 8

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