Corrosion Investigation and Microstructure of High Calcium Fly Ash Reinforced Al6061

Abstract

In this study, the effect of high Ca fly ash on the corrosion behavior and microstructure of Al6061 alloy matrix composite was investigated. The Al6061 matrix composites containing 5, 7, and 10 wt% of fly ash particles were prepared by the stir casting process. The corrosion behavior was investigated using potentiodynamic polarization measurement using 5 wt% NaCl. The results revealed that the Icorr increased from 2.44 µA/cm2 to 8.60 µA/cm2 as the fly ash concentration increased from 5 wt% to 10 wt%. This increase of Icorr indicates an increase of the corrosion rate. The corrosion mainly occurs at the interface between fly ash particles and Al 6061 matrix.