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Electrochemical noise analysis of galvanic corrosion of anodized aluminum in chloride environments

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Title: Electrochemical noise analysis of galvanic corrosion of anodized aluminum in chloride environments
Other Titles: 陽極酸化したアルミニウムのガルバニック腐食の電気化学ノイズ解析
Authors: Sakairi, Masatoshi1 Browse this author →KAKEN DB
Shimoyama, Ukiya2 Browse this author
Takahashi, Hideaki3 Browse this author
Authors(alt): 坂入, 正敏1
下山, 由起也2
高橋, 英明3
Keywords: electrochemical noise
anodizing
galvanic corrosion
aluminum
localized corrosion
Issue Date: Jun-2006
Publisher: 電気化学会
Journal Title: Electrochemistry 電気化学および工業物理化学
Volume: 74
Issue: 6
Start Page: 458
End Page: 462
Abstract: A new type of electrochemical noise analysis technique with First Fourier Transformation, FFT, was applied to galvanic corrosion of barrier and porous type anodic oxide films formed on aluminum in 0.5 kmol/m(3) H3BO4 / 0.05 kmol/m(3) Na2B4O7 solutions with 0.01 kmol/m(3) NaCl. During localized corrosion, the current and potential were changed, with fluctuations and the potential and the current fluctuations show good correlation. The slope of the PSD spectra of both types of anodized specimens are about minus one (-1), just after localized corrosion started. This technique allows observation of electrochemical impedance changes during localized corrosion. The impedance spectra are independent of signal frequency and the impedance of porous types anodic oxide film specimens decrease with immersion time and increases with anodizing time.
Type: article (author version)
URI: http://hdl.handle.net/2115/14554
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)

Submitter: 坂入 正敏

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