Influence of Sulphate and Chlorides Acidic Media on Mechanical and Corrosion Behavior of Fly Ash Particulate Reinforced 2024 Al/TiO2 Composites .

摘要

This research studied the corrosion behavior of 2024 Al/2%TiO2 with different additions of fly ash in 0.1N H2SO4 and 0.1 N HCl media. Using a liquid metallurgy route (stir casting technique) 0, 2, 4 and 6 wt.% of fly ash were added to 2024 Al/2%TiO2 and the density and corrosion potential of the samples was evaluated by potentiodynamic polarization. The highest corrosion current density (7.437 x 10-1) was obtained in 0.1 N HCl media while the corrosion current density in 0.1N H2SO4 media was 2.276 x 10~(-3). The corrosion current density values of 2024 Al/2%TiO2 alloy rose with increase in the fly ash addition from 0.305 x 10~(-2) to 1.08 x 10~(-2) as a result of the micro galvanic coupling between the matrix alloy and the reinforcement or conducting interfacial products . Micro-Vickers hardness of the composite increased from 120 V to 160 V with increasing fly ash content. The values of yield strength increased from (231MP a) to (279 MPa) and the values of ultimate tensile strength (UTS) were increased from (136MPa) to (184MPa) with increase in the percentage of fly ash.