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The relationship between corrosion rate of aluminum (AA 5083) and supply electric voltage in seawater

A.M.Muzathik, H.Sabri, C.W.M.Noor

In this paper effect of electric voltage level on corrosion rate ofAluminum (AA 5083) was studied. Eighty samples plate surfaces were prepared according to the standard procedure. The corrosion studies have been carried out at roomtemperature using seawater. Various level of electric DC voltage (0, 1.5, 3 and 4.5V) applied and sampleswere 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 finalweightswere4.7375 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 ofAluminiumAA5083 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 ofAluminiumAA5083 plate is increasing by increasing of DC electric voltage in seawater.