Corrosion resistance of low SiC particle variation at low weight content on 1060 aluminum matrix composite in sulfate-contaminated seawater
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The effect SiC particle sizes (3 μm, 9 μm 29 μm and 45 μm) at 2.5% weight content on the
corrosion resistance of 1060 aluminum in sulfate and sulfate-chloride solution was studied by
potentiodynamic polarization, open circuit potential measurement and optical microscopy.
Results showed the presence of SiC increases the susceptibility of monolithic aluminum (0 μm
SiC particle size) to corrosion. In the sulfate solution, the corrosion rate values increased from
0.074 mm/y to 0.556 mm/y at 3 μm SiC particle size after which a progressive decrease in
corrosion rate was observed to 0.240 mm/y at 45 μm SiC particle size. The corrosion rate value
in sulfate-chloride solution increased significantly with increase in SiC particle size from 0.580
mm/y (0 μm) to 1.181 mm/y at 45 μm. Open circuit potential plots show monolithic aluminum in
both solutions is the most electronegative, though potential transients were quite visible on the
plot from sulfate-chloride solution. The surface of the corroded 1060AlSiC specimens agree with
the results from electrochemical test with extensive morphological damage.
Keywords
TJ Mechanical engineering and machinery, TP Chemical technology