e-ISSN 2231-8542
ISSN 1511-3701

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Corrosion Inhibition of Azomethines Containing Hydroxyl Group at Ortho and Para Positions on Mild Steel

Syaidah Athirah Dzolin, Yusairie Mohd, Hadariah Bahron and Nurul Huda Abdul Halim

Pertanika Journal of Tropical Agricultural Science, Volume 25, Issue S, March 2017

Keywords: Azomethine, chronoamperometry, corrosion inhibition, electrodeposition, LPR

Published on: 05 Dec 2017

The syntheses of salicylideneaniline (L1a) and 4-hydroxybenzalaniline (L1b) was carried out via condensation reaction giving yields of 80.74% and 81.65% respectively. The compounds were characterised by physical and spectroscopic techniques, namely melting point, micro elemental analysis (C, H and N), ¹H Nuclear Magnetic Resonance (NMR) and Infrared (IR) spectroscopy. The characteristic n(C=N) peaks were observed at 1615 cm-1 and 1575 cm-1 respectively. Chronoamperometry (CA) was employed to electrodeposit both compounds on mild steel at 0.1 M inhibitor concentration in 0.3 M NaOH at three different potentials, +0.8 V, +1.05 V and +1.7 V. Formation of yellow imine films was observed on the mild steel. The corrosion behaviour of coated and uncoated mild steel was studied using Linear Polarization Resistance (LPR) in 0.5 M NaCl. Coated mild steel showed better corrosion resistance and with the highest inhibition efficiency of 90.34%, L1a provides a better protection against corrosion for mild steel than L1b.

ISSN 1511-3701

e-ISSN 2231-8542

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