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Some natural aqueous extracts of plants as green inhibitor for carbon steel corrosion in 0.5 M sulfuric acid |
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| Authors: | M. Abdallah Hatem M. Altass B. A. AL Jahdaly M. M. Salem |
| Affiliation: | 1. Chemistry Department, Faculty of Science, Benha University, Benha, Egypt;2. Chemistry Department, Faculty of Applied Science, Umm Al-Qura University, Makkah, Saudi Arabiametwally555@yahoo.com;4. Chemistry Department, Faculty of Applied Science, Umm Al-Qura University, Makkah, Saudi Arabia;5. Chemistry Department, College of Science, Majmaah University, Al Majmaah, Saudi Arabia |
| Abstract: | The inhibiting impact of natural aqueous extracts of some plants such as curcumin, parsley and cassia bark extracts for the corrosion of carbon steel (C-steel) in 0.5 M H2SO4 solution was inspected utilizing some techniques such as galvanostatic and potentiodynamic anodic polarization and weight loss measurements. Outcomes indicated that the percentage inhibition efficiency increases with increasing the concentration of the extract due to its horizontal adsorption on the C-steel surface. The process of adsorption is followed by the Temkin isotherm. These natural extracts acted as pitting corrosion inhibitors by shifting the pitting potential to more noble values. The sequence of inhibition efficiency of the natural extracts decreases in the following order: cassia bark extract > parsley extract > curcumin extract. This arrangement is related to the molecular size of the major components of the three natural extracts used. |
| Keywords: | Corrosion inhibitors adsorption cassia bark extract parsley extract curcumin extract |