An Investigation of Composite Inclusion Corrosion Resistance Behavior of Thermally Liquid-Melt Inoculated Al-Mg-Si Alloy in Sodium Chloride Medium
No Thumbnail Available
Date
Journal Title
Journal ISSN
Volume Title
Publisher
Springer International Publishing Switzerland
Abstract
Description
Inoculation enhances component performance in
corrosive oxidizing environments and this provides appreciated
protection in high temperature/stress applications. The
corrosion enhancement of Al-Mg-Si alloy in 3.65 % NaCl
solution with varying concentrations of titanium composite
and minor addition of Sn has been studied using linear
potentiodynamic polarization. The mechanical property was
examined using the micro-hardness technique. From the
results all the alloyed samples exhibited lower decreases
in corrosion rate with increases in hardness values as the
percent of TiO2 and SnO2 increases up to 10 %wt in the
Al-Mg-Si alloy as compared to the as-cast sample. Strengthening
efficiencies of 78, 77 and 30 % were obtained at
Al/10Ti-Sn, Al/10Ti and Al/5Ti, respectively. The optimum
values were obtained at 10 wt%Ti-Sn. The increases in
hardness values and corrosion resistance are attributed to
the formation of coherent and uniform precipitation in the
metallic lattice. These results show that improved corrosion
and mechanical properties are achievable by subjecting the
cast Al-Mg-Si alloy to inoculation.
Keywords
T Technology (General), TJ Mechanical engineering and machinery