Assessment of Performance of Sodium Benzoate Corrosion Inhibitor Performance on AA6063 in Sea water

W.B. Wan Nik^1*, O. O. Sulaiman², S.G. Eng Giap³, R. Rosliza⁴ and A.S.A.Kader⁵

1Faculty of Maritime Studies and Marine Science, 3Faculty of Science and Technology, University Malaysia Terengganu, 21030 Kuala Terengganu,Terengganu, Malaysia. 4TATi University College, Teluk Kalung, 24000, Kemaman, Terengganu, Malaysia. 1,5Marine Technology Center, University Technology Malaysia

DOI : http://dx.doi.org/10.13005/bbra/1175

ABSTRACT:

Corrosion is a fundamental process which plays an important role in economics and safety. Apparently, corrosion cannot be avoided, but its severity can be reduced. 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).

KEYWORDS: Aluminium Alloy; Weight loss; Polarization; EIS; Adsorption

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