Corrosion behaviour of aluminium syntactic functionally graded composites
by S.C. Ferreira, A. Velhinho, R.J.C. Silva, L.A. Rocha
International Journal of Materials and Product Technology (IJMPT), Vol. 39, No. 1/2, 2010

Abstract: Syntactic Functionally Graded Metal Matrix Composites (SFGMMC) are a type of composites reinforced by microballoons exhibiting a graded reinforcement distribution. These materials constitute a promising new generation of lightweight structural materials for aerospace, marine and shielding/insulation applications. In this work, A356 alloy reinforced with silica-alumina microballoons (SiO₂-Al₂O₃) was processed by casting techniques. The influence of the microballoon distribution gradient on the corrosion behaviour of the composite was investigated by potentiodynamic polarisation and Electrochemical Impedance Spectroscopy (EIS). Composite surfaces were analysed before and after testing by Optical Microscopy (OM) and Scanning Electron Microscopy (SEM) to determine the influence of microstructural changes.

Online publication date: Sat, 31-Jul-2010

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