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Corrosion is a fundamental process which plays an important role in economics and safety.
Apparently, corrosion cannot be avoided, but its severity can be prevented. Inhibitors have
always been considered to be the first line of defense against corrosion. Several corrosion
inhibitors are available today. The objective of this study was to evaluate the effectiveness of
sodium benzoate as an inhibitor to slow down or prevent corrosion. This project involves the
use of gravimetric measurements, potentiodynamic polarization and electrochemical impedance
spectroscopy (EIS) to evaluate inhibitive action of sodium benzoate on corrosion behavior of
AA6063 aluminium alloy in seawater. The electrochemical measurements showed that the
presence of sodium benzoate as an inhibitor significantly decrease the weight loss, corrosion
current densities (icorr), corrosion rates and double layer capacitance (Cdl), whilst increasing the
polarization resistance (Rp).