Effect of some peel extracts on the corrosion behavior of aluminum alloy in alkaline medium

International Journal of Industrial Chemistry

دوره 6، شماره 4، بهمن 2015، صفحه 317-328

نوع مقاله: research article

شناسه دیجیتال (DOI): https://doi.org/10.1007/s40090-015-0054-8

نویسندگان

Namrata Chaubey¹؛ Vinod Kumar Singh¹؛ M. A. Quraishi^{* 2}

¹Department of Chemistry, Udai Pratap Autonomous College, Varanasi, 221002, India

²Department of Chemistry, Indian Institute of Technology, Banaras Hindu University, Varanasi, 221005, India

چکیده

Introduction
The inhibition performance of three peels, for instance Pisum sativum (PS), Solanum tuberosum (ST), and Citrus reticulata (CR), on aluminum alloy (AA) in 1 M NaOH solution was investigated using weight loss, electrochemical impedance spectroscopy (EIS), linear polarization, and potentiodynamic polarization techniques (Tafel).
Results
It was found that these three peel extracts exhibit very good performance on AA in alkaline medium. PS exhibited maximum inhibition efficiency (η%) of 94.5 % at 1.5 g/L. The effective protection of AA in inhibited system was investigated using scanning electron microscopy (SEM) and atomic force microscopy (AFM).
Conclusion
The adsorption of inhibitors on AA surface obeyed the Langmuir’s adsorption isotherm. Potentiodynamic polarization studies showed mixed mode of corrosion inhibition for all the inhibitors. SEM and AFM complemented well with those obtained from weight loss and electrochemical studies.

کلیدواژه‌ها

Aluminum alloy؛ EIS؛ Corrosion inhibition؛ SEM؛ AFM