Synergistic Combination Effect of Salvia officinalis and Lavandula officinalis on the Corrosion Inhibition of Low-Carbon Steel in the Presence of SO42−- and Cl−-Containing Aqueous Environment
| Autor: | R.O. Leramo, Babatunde Oyebade, Roland Tolulope Loto |
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| Rok vydání: | 2018 |
| Předmět: |
Langmuir
Aqueous solution Carbon steel Chemistry 020209 energy Mechanical Engineering Salvia officinalis technology industry and agriculture 02 engineering and technology engineering.material food.food Corrosion Adsorption food Mechanics of Materials Chemisorption 0202 electrical engineering electronic engineering information engineering engineering General Materials Science Freundlich equation Safety Risk Reliability and Quality Nuclear chemistry |
| Zdroj: | Journal of Failure Analysis and Prevention. 18:1429-1438 |
| ISSN: | 1864-1245 1547-7029 |
| DOI: | 10.1007/s11668-018-0535-0 |
| Popis: | The corrosion inhibition of low-carbon steel in 1 M H2SO4 and HCl solutions by the admixture of Salvia officinalis and Lavandula officinalis essential oil extracts was studied through potentiodynamic polarization analysis, coupon measurement and optical microscopy. The carbon steel undergoes severe surface deterioration in H2SO4, while the morphology of the steel from HCl showed selective deterioration with numerous corrosion pits in the absence of the oil extracts. The extracts performed effectively in the acid media with optimal inhibition efficiency of 86.92 and 96.90% in H2SO4, and 84.68 and 97.59% in HCl from potentiodynamic polarization and coupon analysis. The oil extract displayed anodic inhibition properties in H2SO4 due to surface coverage of the steel and cathodic inhibition in HCl due to selective precipitation of extract molecules. Thermodynamic calculations show the extracts adsorbed onto the steel surface, effectively suppressing the corrosion reactions through chemisorption mechanism according to the Langmuir, Frumkin and Freundlich adsorption isotherms. |
| Databáze: | OpenAIRE |
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