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Depth Elemental Imaging during Corrosion of Hot-Dip Galvanized Steel Sheet by Confocal Micro XRF Analysis

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Abstract

The elucidation of the mechanism for steel corrosion under a coating layer has been attracting research attention. Herein, we utilized a confocal micro-X-ray fluorescence (XRF) analytical instrument to conduct non-destructive elemental analysis near the surface of a steel sheet. Using this method, elemental map images of steel sheet cross sections were obtained without sample destruction. To confirm corrosion suppression in the presence of Mg ions, we observed the corrosion behavior of hot-dip galvanized steel sheets immersed in an aqueous NaCl solution to which Mg ions were added. By using the confocal micro XRF system, the elution of the coating components and the precipitation process of the corrosion products were confirmed.

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Acknowledgements

A part of this work was supported by JSPS KAKENHI Grant Number 17H03080.

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Authors and Affiliations

  1. Research & Development, Nippon Steel Corporation, 20-1 Shintomi-cho, Futtsu, Chiba, 293-8511, Japan

    Koji Akioka

  2. Research & Development, Nippon Steel Corporation, 1-8 Fusou-cho, Amagasaki, Hyogo, 660-0891, Japan

    Takashi Doi

  3. Graduate School of Engineering, Osaka City University (OCU), 3-3-138 Sugimoto, Sumiyoshi, Osaka, 558-8585, Japan

    Shohei Mita, Tsugufumi Matsuyama & Kouichi Tsuji

Authors
  1. Koji Akioka
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  2. Takashi Doi
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  3. Shohei Mita
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  4. Tsugufumi Matsuyama
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  5. Kouichi Tsuji
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Correspondence to Koji Akioka.

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Akioka, K., Doi, T., Mita, S. et al. Depth Elemental Imaging during Corrosion of Hot-Dip Galvanized Steel Sheet by Confocal Micro XRF Analysis. ANAL. SCI. 36, 55–59 (2020). https://doi.org/10.2116/analsci.19SAP04

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  • DOI: https://doi.org/10.2116/analsci.19SAP04

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