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Evaluation of metal cation effects on galvanic corrosion behavior of the A5052 aluminum alloy in low chloride ion containing solutions by electrochemical noise impedance

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Title: Evaluation of metal cation effects on galvanic corrosion behavior of the A5052 aluminum alloy in low chloride ion containing solutions by electrochemical noise impedance
Authors: Sakairi, M. Browse this author →KAKEN DB
Sasaki, R. Browse this author
Kaneko, A. Browse this author
Seki, Y. Browse this author
Nagasawa, D. Browse this author
Keywords: Metal cation
Aluminum alloy
Galvanic corrosion
Electrochemical noise impedance
FFT
Issue Date: 10-Jun-2014
Publisher: Elsevier
Journal Title: Electrochimica Acta
Volume: 131
Start Page: 123
End Page: 129
Publisher DOI: 10.1016/j.electacta.2014.02.010
Abstract: The effects of metal cations on the galvanic corrosion behavior of the A5052 aluminum alloy in low chloride ion containing solutions (tap water) were examined by electrochemical noise impedance. The electrochemical noise impedance and conductance were calculated by the power spectral density (PSD) of the galvanic current and potential. The oscillations in the galvanic current correlate well with the oscillations in the potential. The total charge (summation of galvanic current) during galvanic corrosion tests was suppressed by the addition of Ca2+, while it was increased with Mg2+ addition. Only a small effect on mean impedance and conductance was observed in solutions with Cu2+ and Mg2+, while addition of Ca2+ strongly influences both the mean impedance and conductance. These results may be explained by the passive film structure changes due to the metal cations. The results obtained in this study indicate that metal cations play a very important role in the corrosion behavior of A5052 aluminum alloys in tap water.
Type: article (author version)
URI: http://hdl.handle.net/2115/56996
Appears in Collections:工学院・工学研究院 (Graduate School of Engineering / Faculty of Engineering) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

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