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Analysis of the Initial Stage of Localized Corrosion on Zn and Zn Alloy Coated Steels by Photon Rupture Method

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Title: Analysis of the Initial Stage of Localized Corrosion on Zn and Zn Alloy Coated Steels by Photon Rupture Method
Authors: SAKAIRI, Masatoshi Browse this author →KAKEN DB
ITABASHI, Kazuma Browse this author
TAKAHASHI, Hideaki Browse this author
Keywords: Zn-Al coated steel
localized corrosion
chloride ions
photon rupture method
current transient
Issue Date: Jan-2005
Publisher: 日本鉄鋼協会
Journal Title: ISIJ International
Volume: 45
Issue: 1
Start Page: 71
End Page: 76
Publisher DOI: 10.2355/isijinternational.45.71
Abstract: A photon rupture method, film removal by a focused pulse of pulsed Nd-YAG laser beam irradiation, has been developed as it enables oxide film stripping at extremely high rates without contamination from the film removal tools. In the present study, Zn and Zn-5mass%Al alloy coated steel specimens covered with protective nitrocellulose film were irradiated with a focused pulse of a pulsed Nd-YAG laser beam at a constant potential in 0.5 kmol m-3 H3BO3-0.05 kmol m-3 Na2B4O7 (pH=7.4) with/without 0.05 kmol m-3 of chloride ions to investigate the initial stage of localized corrosion. At low potentials, both samples reformed oxide film after the nitrocellulose films were removed by this method. The oxide film formation kinetics of Zn-55mass%Al follow an inverse logarithmic law, in agreement with Cabrera-Mott theory. However, at high potentials, localized corrosion producing corrosion products occured at the area where nitrocellulose film was removed. The dissolution current of the Zn coated steel samples is higher than that of Zn-5mass%Al coated samples at the same applied potential.
Rights: 著作権は日本鉄鋼協会にある
Type: article
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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