Abstract:
In this paper effect of electric voltage level on corrosion rate of Aluminum
(AA 5083) was studied. Eighty samples plate surfaces were prepared
according to the standard procedure. The corrosion studies have been
carried out at room temperature using seawater. Various level of electric DC
voltage (0, 1.5, 3 and 4.5 V) applied and samples were left for 10, 20, 30 and
40 days in order to determine its corrosion rate for each and every level of
voltages supplied. These samples were analyzed to determine the weight
loss, electrochemical test using Electrochemical Impedance Spectroscopy
and morphology test to determine the corrosion rate of the Aluminium
plate and effect of voltage levels. After 40 days, the final weights of all
samples were differed compare to the initial weights. For 0 V sample initial
and final weights were4.7375 g and 4.7164 g respectively, which is 99.7% of
its initial weight. For 1.5 V sample, initial weight was 4.7262 g and final
weight was 3.8833 g, which is 82.4% of its initial weight. Meanwhile, for
samples of 3 V and 4.5 V, initial weights were 4.7225 g and 4.7511 g
respectively, after 40 days; samples were loosed 1.3025 g and 1.5169 g
respectively. The results reviled that electric voltage is one of the factor
that can accelerate corrosion of Aluminium AA 5083 in seawater. Further,
results indicated that introduction of electric voltage obviously maximize
weight losses and enhance Aluminium dissolution in seawater. As a
conclusion from this study, corrosion rate of Aluminium AA 5083 plate is
increasing by increasing of DC electric voltage in seawater.
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