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SEM Observations On The Porosity Activities During Corrosion Of Al- Si-Mg/SiCp Metal Matrix Composites

B.Dikici, T.Kiyak, C.Tekmen, M.Gavgali

The corrosion mechanisms of the clusters and gas porosities in AlSiMg based metal matrix composites(MMCs) reinforced with SiC particles were determined by SEM observations in deaerated 3.5 wt.% NaCl aqueous solutions. It was found that the composites shown severe pitting behaviors which could be due to the presence of aggressive Cl ions in the solution. In addition, SEM observations revealed that corrosion preferentially started around of cluster and gas porosities and these observations were correlated with the dissolution mechanisms of aluminium.