Electrochemical Studies of the Corrosion Behavior of Al/SiC/PKSA Hybrid Composites in 3.5% NaCl Solution
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Date
2022-09-29
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Journal of Composites Science
Abstract
The corrosion behavior of metal matrix composites (MMCs) is accelerated by the inclusion
of reinforcements. Hence, this study investigates the corrosion behavior of MMCs produced from Al
6063 matrix alloy with reinforcement particulates of silicon carbide (SiC) and palm kernel shell ash
(PKSA) inclusion at different mix ratios. The MMCs were synthesized using the double stir casting
technique. The corrosion behaviors of the composites in NaCl solutions were studied via gravimetric
analysis and electrochemical measurements. The gravimetric analysis showed fluctuating dissolution
rate of the samples in NaCl solution to indicate flawed film as well as corrosion product formation
over the surface of the specimens. The observed corrosion mechanism of the samples was general
and pitting corrosion. The presence of reinforcements within the Al6063 matrix acted as active sites
for corrosion initiation. The range of values for Ecorr and Icorr obtained in 3.5% NaCl at 24 h was
between 220.62 and 899.46 mVandbetween5.45 and 40.87 A/cm2, respectively, while at 72 h,
the Ecorr values ranged from 255.88 to 887.28 mV, and the Icorr ranged from 7.19 to 16.85 A/cm2.
The Nyquist and Bode plots revealed the electrochemical corrosion behavior of the samples under
investigation, with predominant reactions on the surface of the samples linked to charge transfer
processes. The relative resistance to corrosion of the samples depends on the thin oxide film formed
on the surface of the samples
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Ikubanni, P.; Oki, M.; Adeleke, A.; Adesina, O.; Omoniyi, P.; Akinlabi, E. Electrochemical Studies of the Corrosion Behavior of Al/SiC/PKSA Hybrid Composites in 3.5% NaCl Solution. J. Compos. Sci. 2022, 6, 286.