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Conflict of Interest: In relation to this article, we declare that there is no conflict of interest.

Publication history: Received February 28, 2021
Accepted May 18, 2021

This is an Open-Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/bync/3.0) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.

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Corrosion inhibition of aluminum under basic conditions using Medicago sativa L. extract - thermodynamic studies

Rajamohan Natarajan^† Fatma Al Shibli

Chemical Engineering Section, Faculty of Engineering, Sohar University, Sohar, Oman

rnatarajan@su.edu.om

Korean Journal of Chemical Engineering, September 2021, 38(9), 1903-1912(10), 10.1007/s11814-021-0851-z

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Abstract

In this research, corrosion inhibitors were synthesized using locally available biomass, alfalfa plant. The inhibitor performance was evaluated at different operating conditions and the effect of process variables, namely inhibitor concentration (1-5%v/v), operating temperature (308.15-328.15 K) and method of extraction (alcohol and aqueous) were studied. The corrosion rate of aluminum decreased with increase in inhibitor concentration and the best result attained was 3.7mg cm-2 h-1 with 5%v/v AALE and 308.15 K. The increase in temperature resulted in the decrease in inhibition efficiency, which could be related to detachment of inhibitors at elevated temperatures. The Langmuir adsorption Isotherm fitted well to the corrosion experiment data (R2>0.990) and thermodynamic parameters were calculated. The value of separation factor (0

Keywords

Corrosion Inhibition Metal Green Aluminum

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