Mild steel corrosion inhibition by aqueous extract of Hyptis Suaveolens leaves

International Journal of Industrial Chemistry

دوره 5، شماره 1، خرداد 2014، صفحه 31-41

نوع مقاله: research article

شناسه دیجیتال (DOI): https://doi.org/10.1007/s40090-014-0005-9

نویسندگان

P. Muthukrishnan¹؛ B. Jeyaprabha²؛ P. Prakash^{* 1}

¹Department of Chemistry, Thiagarajar College, Madurai, 625009, Tamilnadu, India

²Department of Civil Engineering, Fatima Michael College of Engineering and Technology, Madurai, 625020, Tamilnadu, India

چکیده

Hyptis suaveolens leaf extract (HSLE) as corrosion inhibitor in 1 M H₂SO₄ was evaluated using mass loss measurement as well as potentiodynamic polarization and electrochemical impedance spectroscopy measurements. The extract was found to efficiently inhibit the corrosion process in 1 M H₂SO₄ and inhibition efficiency increased with increasing extract concentration. Maximum inhibition efficiency of HSLE in 1 M H₂SO₄ was found to be 95 %. The potentiodynamic polarization results revealed that HSLE acted as mixed-type inhibitor. The adsorption of the studied inhibitor on mild steel obeyed Langmuir adsorption isotherm. The nature of protective film formed on the surface of the mild steel was confirmed by FT-IR, XRD and SEM techniques. This study clearly shows the efficiency of HSLE for control of mild steel corrosion in 1 M H₂SO₄ solutions.

کلیدواژه‌ها

Mild steel؛ Corrosion inhibition؛ Hyptis suaveolens؛ XRD؛ Polarization؛ SEM