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The Research of Electrochemical Behavior of Alloy AA5083 in 3.5% NaCl Solution

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Abstract:

The effect of scanning rate on the AA 5083 electrochemical behavior in 3.5% NaCl solution has been investigated using measurements of potentiodynamic polarization and cyclic polarization experiment. The results showed that when the scanning rate was in the range of 0.2mV/s to 5.0mV/s, the influence on the potential of pitting Epit was small, thus the scanning rate 0.5mV/s was selected. The pitting originated from intermetallic inclusions Mg2Si and resulted in corrosion of aluminium matrix adjacent to the inclusions. Experiment revealed that decrease in the chloride concentration slightly shifted both the pitting Epit and corrosion potentials Ecorr to more active values. But the effect was changed slight when the chloride concentration exceed to 1.0%.

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Periodical:

Advanced Materials Research (Volume 676)

Pages:

80-84

DOI:

https://doi.org/10.4028/www.scientific.net/AMR.676.80

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Online since:

March 2013

Authors:

Shan Chen, Guo Ming Li, Wan Shun Chang, Xue Qun Chen

Keywords:

AA5083 Aluminum Alloy, Cyclic Polarization Curves, Intermetallic Inclusion, Pitting Corrosion, Potentiodynamic Polarization Curves, Scanning Rate

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© 2013 Trans Tech Publications Ltd. All Rights Reserved

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