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Synergistic effect of halide ions and gum arabic for the corrosion inhibition of API5L X70 pipeline steel in H 2 SO 4
Author(s) -
Djellab Mounir,
Bentrah Hamza,
Chala Abdelouahad,
Taoui Hicham
Publication year - 2019
Publication title -
materials and corrosion
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.487
H-Index - 55
eISSN - 1521-4176
pISSN - 0947-5117
DOI - 10.1002/maco.201810203
Subject(s) - sulfuric acid , halide , scanning electron microscope , bromide , adsorption , corrosion , potassium bromide , iodide , chemistry , inorganic chemistry , dielectric spectroscopy , electrochemistry , chloride , potassium , langmuir adsorption model , ion , nuclear chemistry , materials science , electrode , organic chemistry , composite material
This paper aims to increase the inhibition efficiency of gum arabic (GA) for the corrosion of API5L X70 pipeline steel in sulfuric acid through the addition of halide ions (potassium iodide [KI], potassium chloride [KCl], and potassium bromide [KBr]). The synergistic effect of GA and halide ions has been studied using potentiodynamic polarization curves, electrochemical impedance spectroscopy, and surface analysis by scanning electron microscope (SEM). The results show that substantial corrosion inhibition (99%) using 2 g L −1 GA and 0.5 mM KI can be obtained in synergistic manner. The adsorption of GA in combination with iodide ions follows Langmuir adsorption isotherm. GA combined with KI acts as a mixed‐type inhibitor in sulfuric acid.