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Corrosion inhibition of mild steel in HCL solution by pectin

2014; Elsevier BV; Volume: 92; Linguagem: Inglês

10.1016/j.corsci.2014.12.002

1879-0496

María V. Fiori-Bimbi, Patricia Álvarez, Hugo Rolando Vaca, C.A. Gervasi,

Hydrogen embrittlement and corrosion behaviors in metals

This work describes the successful performance of pectin as an eco-friendly corrosion inhibitor for mild steel in HCl solution. The inhibition mechanism is discussed considering thermodynamics of adsorption and kinetics of the electrochemical reactions. Inhibition efficiency increases with temperature while the activation energy for the corrosion rate decreases with the addition of pectin. Pectin is a mixed-type inhibitor and the mode of inhibition results from the geometric blocking effect of chemisorbed inhibitive species at the metal surface. Spectroscopic analysis points to the formation of a complex between pectin and Fe2+ ions released during the corrosion reaction.