Formation of artificial micro‐pits on Al alloy with the photon rupture method and the localized corrosion behavior of the formed pits |
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| Authors: | K Yanada M Sakairi T Kikuchi Y Oya Y Kojima |
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| Institution: | 1. Graduate School of Engineering, Hokkaido University, Kita‐13, Nishi‐8, Kita‐ku, Sapporo 060‐8628, Japan;2. Technical Research Division, Furukawa‐Sky Aluminum Corp., Akihabara UDX, 14‐1, Sotokanda 4‐chome, Chiyoda‐ku, Tokyo 101‐8970, Japan |
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| Abstract: | An in situ artificial micro‐pit fabrication method with an area selective electrochemical measurement technique was applied to investigate the effect of the geometry of artificially formed pits on their localized corrosion behavior in anodized 1000 series aluminum. This technique enables the fabrication of artificial micro‐pits with different aspect ratios (pit depth/pit diameter) in solutions. The aspect ratios of the fabricated artificial micro‐pits in this experiment could be varied from 0.13 to 1.83 by controlling the irradiation time of the focused pulsed YAG laser beam. By applying a constant potential to the final laser‐beam‐irradiated spot in chloride environments, localized dissolution occurred only at the laser beam irradiated area, because the anodic oxide film acted as an insulator. The corrosion current and charge increase with increasing aspect ratio at any applied potential. Copyright © 2010 John Wiley & Sons, Ltd. |
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| Keywords: | pitting corrosion aluminum pulsed laser beam irradiation chloride ion artificial micro‐pit |
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