Chemical Composition and Inhibitory Effect of the Essential Oil from Lippia Citriodora Irrigated by Wastewater on the Alkaline Corrosion of Aluminum

Abstract

The objective of this study is the valorization of the essential oil (EO) of Lippia citriodora irrigated by urban wastewater from the city of Settat-Morocco. We have tested it as a corrosion inhibitor of aluminum in 0.1 M Na 2 CO 3 using polarization method, weight loss, and EIS measurements. The inhibition efficiency of lippia citriodora oil was calculated and compared. We found good agreement between the referred methods. The results obtained revealed that the tested inhibitor reduces differently the kinetic of the corrosion process of aluminum. Its efficiency increases with the concentration and attained 90.33% at 1800 ppm. The effect of temperature on the corrosion behaviour of aluminum in 0.1 M Na 2 CO 3 was also studied in the range 283 K and 313 K. The thermodynamic data of activation were determined. The analysis of Lippia citriodora oil, obtained by hydro-distillation, using gas chromatography (GC), showed that the major components are neral 13.85%, geranial 14.06% and limonene 28.32%.

Inhibition of Aluminum Corrosion in 0.1 M Na2CO3 by Mentha pulegium

“…The diameter of the loops raised with increasing concentrations, reflecting an enhancement in the charge transfer resistance and, thereafter, an increase in the inhibitor efficiency [29]. The results in Table 3 show that the addition of the inhibitor led to an increase in RT values, which measure the electron transfer across the surface [30][31] and hence, the rise of inhibition efficiency. The decrease in Cd1 can be explained by the adsorption of the inhibitor molecules onto the aluminum surface, by forming an electronic double layer [32].…”

Estudo da eficiência do Orbignya oleifera como inibidor verde de corrosão para aço com baixo teor de carbono comparado com inibidor comercial em solução HCl 1M

“…A aceitação desses inibidores na linha industrial é justificado pelas excelentes propriedades anticorrosivas. Sua utilização pode ser vista em unidades de refino, tubulações de sistemas de resfriamento, caldeiras e em processos de produção de petróleo e gás [6][7][8][9][10].…”