Analysis of SiC grain size variation and NaCl concentration on the corrosion susceptibility of AA1070 aluminium matrix composites

Loto, R. T. and Babalola, P.O. (2018) Analysis of SiC grain size variation and NaCl concentration on the corrosion susceptibility of AA1070 aluminium matrix composites. Cogent Engineering, 5.

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Abstract

Analysis of the impact SiC grain size at 10% wt. on the corrosion resistance of AA1070 aluminium matrix composites was studied in Cl− anion containing dilute H2SO4 solution. Studies were performed with potentiodynamic polarization and open circuit potential (OCP) measurement. Optical microscopic studies were performed on the corroded matrix composites. Results show that the corrosion susceptibility of the composites increased proportionately with increase in Cl− ion concentration. The matrix composites at 3 um and 9 um SiC grain size exhibited the lowest corrosion rate values in comparison to the base alloy and composites with larger SiC grain sizes. OCP values for the matrix composite at 0 μm SiC in the acid solution (0.25 M H2SO4/0% and 0.25% NaCl) was the most electronegative due to lower thermodynamic stability than matrix composites with larger SiC grain sizes. Optical microscopic studies show that corrosion was mainly localized for all specimens tested due to pitting at low Cl− ion concentration in comparison to general corrosion for the metal substrate and total destruction of the matrix composite morphology at higher chloride concentration. Results of statistical analysis through ANOVA showed that SiC grain sizes are more.

Item Type:	Article
Uncontrolled Keywords:	corrosion; silicon carbide; aluminium; sodium chloride; composite
Subjects:	T Technology > TD Environmental technology. Sanitary engineering T Technology > TJ Mechanical engineering and machinery
Divisions:	Faculty of Engineering, Science and Mathematics > School of Engineering Sciences
Depositing User:	Mrs Patricia Nwokealisi
Date Deposited:	30 Aug 2018 12:47
Last Modified:	30 Aug 2018 12:47
URI:	http://eprints.covenantuniversity.edu.ng/id/eprint/11446

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