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Initial Stage of Localized Corrosion in Artificial Pits Formed with Photon Rupture on 55mass%Al–Zn Coated Steels

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ISIJ Int., Vol. 46 (2006), No. 8, pp. 1218–1222.pdf852.44 kBPDFView/Open
Please use this identifier to cite or link to this item:http://hdl.handle.net/2115/76150

Title: Initial Stage of Localized Corrosion in Artificial Pits Formed with Photon Rupture on 55mass%Al–Zn Coated Steels
Authors: Sakairi, Masatoshi Browse this author →KAKEN DB
Uchida, Yoshiyuki Browse this author
Takahashi, Hideaki Browse this author
Keywords: 55mass%Al-Zn coated steel
aritificial pit
localized corrosion
chloride ions
photon rupture method
Issue Date: 15-Aug-2006
Publisher: 日本鉄鋼協会
Journal Title: ISIJ International
Volume: 46
Issue: 8
Start Page: 1218
End Page: 1222
Publisher DOI: 10.2355/isijinternational.46.1218
Abstract: The photon rupture method, whose oxide film and metal are removed by focused pulsed Nd–YAG laser beam irradiation was applied to form artificial micro pits in 55 mass% aluminum–zinc coated steels. The 15 μm coated layer was removed by 2 s of continuous laser irradiation in this experiment. The rest potential transients were measured during the laser irradiation. While the coated layer covered the steel substrate, the rest potential change in the negative direction just after the starts of the laser irradiation and then returned to the previous value. However, after the steel substrate was exposed to solution, the rest potential moved in the positive direction immediately after the discontinuation of the laser irradiation and then also returned to the previous value. The amplitude and duration of the potential changes after the laser irradiation increased with longer irradiation, related to the pit depth and exposed area ratio of coated layer/steel substrate. These rest potential fluctuation differences can be explained by galvanic reaction changes in the artificial pit formed on the coated steel during irradiation.
Rights: 著作権は日本鉄鋼協会にある
Type: article
URI: http://hdl.handle.net/2115/76150
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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