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The effects of film thickness and incorporated anions on pitting corrosion of aluminum with barrier-type oxide films formed in neutral borate and phosphate electrolytes

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Title: The effects of film thickness and incorporated anions on pitting corrosion of aluminum with barrier-type oxide films formed in neutral borate and phosphate electrolytes
Authors: Habazaki, Hiroki Browse this author →KAKEN DB
Nishimura, Rokuro Browse this author
Okitsu, Kenji Browse this author
Inoue, Hiroyuki Browse this author
Kiriyama, Ikuo Browse this author
Kataoka, Fumitaka Browse this author
Sakairi, Masatoshi Browse this author
Takahashi, Hideaki Browse this author
Keywords: Aluminum
Pitting corrosion
Anodic film
Chloride solution
Ion selectivity
Issue Date: Feb-2014
Publisher: Springer
Journal Title: Journal of solid state electrochemistry
Volume: 18
Issue: 2
Start Page: 369
End Page: 376
Publisher DOI: 10.1007/s10008-013-2192-2
Abstract: The pitting corrosion behavior of high-purity aluminum covered with barrier-type anodic films, which are formed in neutral borate and phosphate electrolytes, has been examined in 0.5 mol dm(-3) NaCl solution at an applied potential of -0.6 V versus Ag/AgCl, which is slightly nobler than the pitting potential of -0.64 V in the same solution. The pitting current density, i (p), increased with time after an incubation time, t (i). The double logarithmic plot of i (p) and polarization time, t, reveal two straight lines, which are separated at the time, tau. The slope becomes larger after tau for the specimens anodized in the phosphate electrolyte, while it becomes smaller for those in the borate electrolyte. Both the t (i) and tau increase with the thickness of the anodic films, and at the similar film thickness, they are much larger for the anodic films formed in the phosphate electrolyte than for those in the borate electrolyte. The corrosion process can be divided into three stages: the incubation period up to t (i), the pit nucleation period before tau, and the pit growth period after tau. We have discussed the different pitting corrosion behavior of the aluminum specimens covered with the anodic films formed in the borate and phosphate electrolytes in terms of ion selectivity of the anodic films.
Rights: The final publication is available at link.springer.com
Type: article (author version)
URI: http://hdl.handle.net/2115/57823
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: 幅崎 浩樹

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