Abstract
Analysis of the impact SiC grain size at 10% wt. on the corrosion resistance of AA1070 aluminium matrix composites was studied in Cl− anion containing dilute H2SO4 solution. Studies were performed ...
Highlights
Corrosion resistance of aluminium alloys is the product of interfacial oxide evolution; the oxide is subject to localized breakdown resulting in pitting and general and crevice corrosion of the substrate metal
Potentiodynamic polarization studies Anodic–cathodic polarization plots for AA1070/Silicon carbide (SiC) with specific SiC grain size (3μm, 9 μm, 29 μm and 45 μm SiC grain size) in 0.25M H2SO4 solution at 0%, 0.25%, 0.5%, 0.75% and 1% NaCl concentration are shown from Figure 1(a) to 1(e)
Observation of AA1070 corrosion at 0 μm SiC grain size in 0.25M H2SO4/0%, 0.25%, 0.5%, 0.75% and 1% NaCl solution shows a relative increase in corrosion rate of AA1070 with increase in Cl− concentration from 1.185 mm/y at 0% NaCl to 2.251 mm/y at 1% NaCl
Summary
Corrosion resistance of aluminium alloys is the product of interfacial oxide evolution; the oxide is subject to localized breakdown resulting in pitting and general and crevice corrosion of the substrate metal. Aluminium silicon matrix composites (Al-SiC) are new generation of engineering materials for applications such as in automobiles, aeronautics, electronics, recreation and military industries (Chawla, 2013; Lees, Dhihra, & McCullough, 2005; Surappa, 2003). They consist of SiC grains scattered within aluminium alloy substrate. The characteristics of the composites is subject to the individual characteristics of the intermetallic phases, their corresponding volume, grain dimension and orientation within the matrix (George, Totten, & Scott, 2003; William, 2007) They transmit applied loads to scattered reinforcements secured with the matrix (Pai, Rajan, & Pillai, 2004). Dispersion of SiC substituents within the matrix material is dependent on properties such as deformation and flow of the molten matrix, technique of grain incorporation and their interaction during the admixture process (Hashim, Looney, & Hashmi, 2002)
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