Investigation of Green Corrosion Inhibitor Based on Aloe vera (L.) Burm. F. for the Protection of Bronze B66 in 3% NaCl

The objective of this work is the development of a new green inhibitor extracted from Aloe vera (L.) Burm. F. (syn. Aloe barbadensis Mill.) for the corrosion inhibition of bronze B66 in a neutral chloride environment (3%NaCl). The tannins extract was obtained from the green rind of Aloe vera by maceration process method. The major compound of the TAV is Linolenic acid (16.59%). The study of the tannins extract from Aloe vera (TAV) was carried out by coupling gravimetric and electrochemical (stationary and transitory) methods, namely the plot of the polarization curves and electrochemical impedance diagrams. Surface analysis of bronze samples was performed using an SEM (scanning electron microscope) coupled to EDS (energy dispersive X-ray spectroscopy), which helped to highlight the protective effect of the TAV studied. The experimental results obtained allowed to note that the inhibition efficiency reaches 89% at 150 ppm of TAV in 3%NaCl. This inhibitor acts by modifying the mechanism of the processes involved at the interface Bronze/3%NaCl.