Loto, R. T. and Babalola, P.O. (2019) Electrochemical analysis of SiC compositeadditions at 7.5% weight content on the corrosionresistance of monolithic aluminium alloy insulphate–chloride solution. Journal of Materials Research and Technology.
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Abstract
tEffect of specific SiC particle sizes on the corrosion resistance and metastable pittingbehaviour of AA1060 aluminium at 7.5% SiC weight content in 0.05 M H2SO4, 0.3 M NaCland 0.05 M H2SO4/0.3 M NaCl solution was studied with potentiodynamic polarization, opencircuit potential measurement and optical microscopy. SiC slightly increased the suscepti-bility of aluminium matrix composite (AA1060/SiC) at 9 �m and 29 �m in H2SO4and NaClsolutions. The lowest corrosion rate values were observed at 3 �m and 45 �m SiC particlesize. Two metastable pitting portions were visible on the polarization plots at these particlessizes due to passivation and re-initiation of transient corrosion pits. The metastable pittingportion of the polarization plots for AA1060/SiC in H2SO4varied over wider corrosion poten-tial and higher corrosion current compared to the plots from NaCl solution. The relativelysmooth transition of the polarization plots in NaCl from anodic polarization to metastablepitting activity of the matrix composite resulted in more concentrated localized corrosion.The effect of SiC particle sizes in the admixed H2SO4–NaCl solution significantly contraststhe earlier observations. The OCP plots in H2SO4and NaCl solution shows AA1060/SiC at45 �m was most electropositive due to the combined action of the protective oxide fromaluminium and insulating properties of SiC. The plots at 0 �m for both solutions were com-paratively electronegative. Morphological damage of AA1060/SiC at 0 �m was significantlymore than the deterioration at 3 �m and 45 �m.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | Pitting Corrosion SiC Aluminium |
| Subjects: | T Technology > T Technology (General) T Technology > TJ Mechanical engineering and machinery T Technology > TP Chemical technology |
| Divisions: | Faculty of Engineering, Science and Mathematics > School of Engineering Sciences |
| Depositing User: | Mrs Patricia Nwokealisi |
| Date Deposited: | 05 Jun 2019 08:50 |
| Last Modified: | 05 Jun 2019 08:50 |
| URI: | http://eprints.covenantuniversity.edu.ng/id/eprint/12718 |
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