Galactomannan as a new bio-sourced corrosion inhibitor for iron in acidic media
Said Abbout,
Meryem Zouarhi,
Driss Chebabe,
Mohamed Damej,
Avni Berisha,
Najat Hajjaji
Affiliations
Said Abbout
Laboratory of Materials, Electrochemistry and Environment, Team of Corrosion, Protection and Environment, Department of Chemistry, Faculty of Sciences, Ibn Tofail University, BP 133, 14000 Kenitra, Morocco; Corresponding author.
Meryem Zouarhi
Laboratory of Materials, Electrochemistry and Environment, Team of Corrosion, Protection and Environment, Department of Chemistry, Faculty of Sciences, Ibn Tofail University, BP 133, 14000 Kenitra, Morocco
Driss Chebabe
Laboratory of Natural Substances & Synthesis and Molecular Dynamic, Faculty of Sciences and Techniques, Moulay Ismail University of Meknes, BP 509, 52000, Boutalamine, Errachidia, Morocco
Mohamed Damej
Laboratory of Materials, Electrochemistry and Environment, Team of Corrosion, Protection and Environment, Department of Chemistry, Faculty of Sciences, Ibn Tofail University, BP 133, 14000 Kenitra, Morocco
Avni Berisha
Department of Chemistry, Faculty of Natural and Mathematics Science, Prishtina University, 10000, Prishtina, Kosovo, Serbia
Najat Hajjaji
Laboratory of Materials, Electrochemistry and Environment, Team of Corrosion, Protection and Environment, Department of Chemistry, Faculty of Sciences, Ibn Tofail University, BP 133, 14000 Kenitra, Morocco
The aim of this study is to evaluate the impact of a bio-sourced polymer as a corrosion inhibitor against iron corrosion in a 1 M HCl solution. Galactomannan was obtained from the carob plant (Ceratonia Siliqua L) and its structure was verified by infrared spectroscopy (FTIR) and elemental analysis. The inhibitor concentration effects and immersion time on the resistance of the iron surface against corrosion are evaluated using impedance and polarization electrochemical measurements, UV-visible analysis and theoretical study. The results show that the galactomannan is a mixed type inhibitor act by physisorption and chemisorption on the metal surface. In addition, the efficiency of these compounds increases with increasing the concentration of the inhibitor and reaches a value of 87.72% at a concentration of 1 g/l. The electrode surface was characterized by SEM surface analysis method coupled with EDS.
