2024-03-29T10:16:04Zhttps://eprints.lib.hokudai.ac.jp/dspace-oai/requestoai:eprints.lib.hokudai.ac.jp:2115/761502023-08-09T02:28:43Zhdl_2115_20045hdl_2115_139Initial Stage of Localized Corrosion in Artificial Pits Formed with Photon Rupture on 55mass%Al–Zn Coated SteelsSakairi, MasatoshiUchida, YoshiyukiTakahashi, Hideaki55mass%Al-Zn coated steelaritificial pitlocalized corrosionchloride ionsphoton rupture method566The 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.日本鉄鋼協会Journal Articleapplication/pdfhttp://hdl.handle.net/2115/76150https://eprints.lib.hokudai.ac.jp/dspace/bitstream/2115/76150/1/ISIJ%20Int.%2c%20Vol.%2046%20%282006%29%2c%20No.%208%2c%20pp.%201218-1222.pdf0915-15591347-5460AA10680712ISIJ International468121812222006-08-15enginfo:doi/10.2355/isijinternational.46.1218著作権は日本鉄鋼協会にあるpublisher