| Autor: |
Djellab, Mounir, Bentrah, Hamza, Chala, Abdelouahad, Taoui, Hicham |
| Předmět: |
|
| Zdroj: |
Materials & Corrosion / Werkstoffe und Korrosion; Jan2019, Vol. 70 Issue 1, p149-160, 12p |
| Abstrakt: |
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. Gum arabic moderately retarded the corrosion of API 5L X70 steel in 0.5 M H2SO4. The best synergistic effect between GA and halide ions has been found for the iodide ion, while chloride and bromide ions were in the second place with almost the same degree. The addition of iodide ions enhances the inhibition efficiency of GA significantly, from 52% to 99%. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
|
Plný text