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Corrosion Behavior of an Artificially Aged (T6) Al–Si–Mg-based Metal Matrix Composite

Faculty of Engineering, Department of Mechanical Engineering Ataturk University, 25240, Erzurum, Turkey bdikici{at}atauni.edu.tr

M. Gavgali

Faculty of Engineering, Department of Mechanical Engineering Ataturk University, 25240, Erzurum, Turkey

C. Tekmen

Faculty of Engineering, Department of Metallurgical and Materials Engineering Dokuz Eylul University, 35100, Izmir, Turkey

The influence of age hardening on the corrosion behavior of Al–Si–Mg-based metal matrix composites (MMCs) has been investigated in aerated and deaerated 3.5 wt% aqueous NaCl solutions. Silicon carbide particle (SiC_p reinforced composites consisting of 10 and 20 vol% SiC_p are produced by the compocasting technique. After the extrusion process, the composites are artificially aged (T6). The corrosion resistances of the aged composites are analyzed by measuring the cyclic potentiodynamic polarization. The surface morphology of the composites before and after the corrosion tests are determined by using metallographic methods and scanning electron microscopy (SEM). In addition, the X-ray diffraction technique (XRD) has been used to determine the phases that occur at the matrix–reinforcement interface. The results demonstrate that the E_pit values of unreinforced matrix alloy and composites increase negatively with increasing aging time. It is also observed that corrosion preferentially starts at the interface of Al–Mg₂Si and Al–SiC_p.

Key Words: aluminum-based metal matrix composite • corrosion • polarization • age hardening

This version was published on July 1, 2006

Journal of Composite Materials, Vol. 40, No. 14, 1259-1269 (2006)
DOI: 10.1177/0021998305057434


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