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Electrochemical Random Signal Analysis during Galvanic Corrosion of Anodized Aluminum Alloy

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Title: Electrochemical Random Signal Analysis during Galvanic Corrosion of Anodized Aluminum Alloy
Authors: Sakairi, Masatoshi Browse this author →KAKEN DB
Shimoyama, Yukiya Browse this author
Keywords: Electrochemical noise
Electrochemical impedance
Anodizing
Aluminum
Galvanic corrosion
Chloride ion
Issue Date: 5-Jun-2007
Publisher: 日本実験力学会
Journal Title: 実験力学
Journal Title(alt): Journal of JSEM
Volume: 7
Issue: Special Issue
Start Page: 114
End Page: 119
Publisher DOI: 10.11395/jjsem.7.s114
Abstract: A new type of electrochemical random signal analysis technique was applied to galvanic corrosion of anodic oxide films formed on 6061-T6 aluminum alloy in NaCl containing 0.5 kmol⁄m3 H3BO4 ⁄ 0.05 kmol⁄m3 Na2B4O7 solutions. The effect of the anodic oxide film structure on the galvanic corrosion resistance was also examined. During incubation (before localized corrosion started), both current and potential change slightly from the initial value. The incubation period of porous type anodic oxide specimens is longer than that of barrier type anodic oxide specimens. During localized corrosion, the current and potential changing with fluctuations, and the potential and the current fluctuations show good correlation. The slope of the PSD of both potential spectra of anodized specimens is about minus one ( -1 ), after the localized corrosion has started. This technique allows observation of electrochemical impedance changes during localized corrosion.
Type: article
URI: http://hdl.handle.net/2115/75958
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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