Corrosion of Aluminum Alloy Metal Matrix Composites in Neutral Chloride Solutions
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ASM International
Abstract
Description
The electrochemical behavior of UNS
A0332.00S, UNS A0332.20S, UNS A0359.00S, and UNS
A0359.20S aluminum alloys were studied in NaCl media
through weight loss, potentiodynamic, and cyclic polarization
techniques. UNS A0332.20S and UNS A0359.20S
were reinforced with SiC, 20% by volume while the other
two samples were not reinforced. Scanning electron
microscopy and energy dispersive spectroscopy were used
to analyze the role of intermetallic phases in both the
corroded and non-corroded aluminum alloy samples.
Results showed that unreinforced alloys have lower corrosion
rates compared to the reinforced alloys. Pits on the
reinforced alloys were significantly more numerous, shallower,
and widespread than on the monolithic alloys. Al/
SiC interface particles and intermetallic phases were
observed to form at the mouth of the pits especially in
alloys reinforced with SiC particles which might have
contributed significantly to the weakening of regions where
localized corrosion occurs. The result shows that intermetallic
phases may directly influence the corrosion
behavior of the aluminum alloys
Keywords
T Technology (General), TJ Mechanical engineering and machinery