CHAMOMILE (Matricaria recutita) EXTRACT AS A CORROSION INHIBITOR FOR MILD STEEL IN HYDROCHLORIC ACID SOLUTION |
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| Authors: | Mahdi Nasibi Davood Zaarei Gholamreza Rashed Effat Ghasemi |
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| Affiliation: | 1. Technical Inspection Engineering Department , Petroleum University of Technology (PUT) , Abadan , Iran;2. Health and Safety Engineering (HSE) Office , National Iranian Oil Refining and Distribution Company (NIORDC) , Yazd Zone , Yazd , Iran mahdi.nasibi@gmail.com;5. m_nasibi@yahoo.com;6. Department of Polymer , Technical Faculty, South Tehran Branch, Islamic Azad University , Tehran , Iran;7. Technical Inspection Engineering Department , Petroleum University of Technology (PUT) , Abadan , Iran;8. Chemical Engineering Department , Ferdowsi University of Mashhad , Mashhad , Iran |
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| Abstract: | The corrosion inhibition of mild steel in hydrochloric acid solution by chamomile (Matricaria recutita) extract (CE) was investigated through electrochemical (polarization, EIS) and surface analysis (optical microscopy/AFM/SEM) techniques. The effects of inhibitor concentration, temperature, and pH were evaluated. Thermodynamic parameters were calculated and adsorption studies were carried out. Finally, the surface morphology was investigated. The electrochemical studies showed that CE acts as a mixed-type corrosion inhibitor with predominantly anodic behavior. CE was adsorbed physically on the metal surface and obeyed the Langmuir adsorption isotherm. It impeded the corrosion processes by changing the activation energy. In the presence of CE, the metal surface was more uniform than the surface in the absence of inhibitor. Maximum inhibition efficiency (IE) was 93.28%, which was obtained at 22°C in 7.2 g/L of inhibitor in 1 M HCl solution. |
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| Keywords: | Chamomile extract Corrosion Corrosion inhibitors Green inhibitors Mild steel Natural product |
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