Akioka Koji, Doi Takashi, Mita Shohei, Matsuyama Tsugufumi, Tsuji Kouichi
Research & Development, Nippon Steel Corporation, 20-1 Shintomi-cho, Futtsu, Chiba, 293-8511, Japan.
Research & Development, Nippon Steel Corporation, 1-8 Fusou-cho, Amagasaki, Hyogo, 660-0891, Japan.
Anal Sci. 2020 Jan 10;36(1):55-59. doi: 10.2116/analsci.19SAP04. Epub 2019 Nov 22.
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.
涂层下钢材腐蚀机制的阐明一直备受研究关注。在此，我们利用共聚焦微X射线荧光（XRF）分析仪对钢板表面附近进行无损元素分析。通过这种方法，在不破坏样品的情况下获得了钢板横截面的元素分布图。为了确认镁离子存在时的腐蚀抑制情况，我们观察了浸入添加了镁离子的NaCl水溶液中的热镀锌钢板的腐蚀行为。通过使用共聚焦微XRF系统，证实了涂层成分的洗脱和腐蚀产物的沉淀过程。
