Journal
MATERIALS AND CORROSION-WERKSTOFFE UND KORROSION
Volume 70, Issue 1, Pages 149-160Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/maco.201810203
Keywords
API5L X70 pipeline steel; EIS; gum arabic; iodide ions; sulfuric acid; synergistic effect
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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.
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