Microstructural and Corrosion Aspects of Aluminium-Zirconia Metal Matrix Composites in Acidic Condition
| International Journal of Mechanical Engineering |
| © 2019 by SSRG - IJME Journal |
| Volume 6 Issue 11 |
| Year of Publication : 2019 |
| Authors : S.Roseline, Dr.V.Paramasivam |
10.14445/23488360/IJME-V6I11P104
How to Cite?
S.Roseline, Dr.V.Paramasivam, "Microstructural and Corrosion Aspects of Aluminium-Zirconia Metal Matrix Composites in Acidic Condition," SSRG International Journal of Mechanical Engineering, vol. 6, no. 11, pp. 19-23, 2019. Crossref, https://doi.org/10.14445/23488360/IJME-V6I11P104
Abstract:
Aluminum (Al6061) reinforced with ZrO2 was fabricated using stir casting techniques. In the present study, this composite's corrosion behavior was investigated with 0, 5, 10, and 15 vol% of ZrO2. This work investigates the corrosion rates of Al6061-ZrO2 composites by weight loss and electrochemical polarization methods. In the weight-loss method, the base metal and its composites were immersed in 0.1M hydrochloric acid (HCl) solution for 480 hours, periodically measuring the losses in weight. The composite was immersed in a 0.1M HCl solution in the electrochemical polarization method, and its corrosion parameters such as corrosion potential (Ecorr) and corrosion current (Icorr) were evaluated. In both weight loss and polarization methods, the corrosion rate of Al6061 was found to be more than the composites, and the composite with 15 vol% of zirconia had the least corrosion rate. The surface morphology of Aluminum before and after corrosion was investigated using scanning electron microscopic images (SEM). Before corrosion, the results showed that ZrO2 particles were finely distributed in the matrix with a little agglomeration in some areas. The microscopic images after corrosion revealed very deep pits in Al6061 alloy. The pits were seen as shallow as the volume % of reinforcement increased.
Keywords:
metal matrix composite, stir casting, corrosion, weight-loss method, electrochemical polarization, microstructure.
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