in-situ ラマン分光法を用いた模擬酸性雨水溶液中における溶融Znめっき鋼板の腐食過程の解析 [in Japanese] Analysis of Corrosion Process of Hot-Dip Zinc-Coated Steel Sheets in Simulated Acid Rain Solution with in-situ Raman Spectroscopy [in Japanese]
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Hot-dip zinc-coated steel sheets are used as an outdoor industrial material, but they corrode because of acid rain.<br>In this study, the corrosion process of hot-dip zinc-coated steel sheets in simulated acid rain solution with <i>in-situ</i> Raman spectroscopy has been studied.<br>The current density of specimen decreased with constant potential holding at −0.6V vs. Ag/AgCl in simulated acid rain solution. And, the main peak, ZnSO<sub>4</sub>·7H<sub>2</sub>O was detected with <i>in-situ</i> Raman spectroscopy at the time of decreasing current density. Therefore, it is considered to be the case that the following equation describes the reactions that occurred.<br>Zn<sup>2+</sup>+SO<sub>4</sub><sup>2−</sup>+7H<sub>2</sub>O→ZnSO<sub>4</sub>·7H<sub>2</sub>O.<br>The current density was decreased by ZnSO<sub>4</sub>·7H<sub>2</sub>O because the growth of ZnSO<sub>4</sub>·7H<sub>2</sub>O covered surface area of the specimen.<br>Hot-dip zinc-coated steel sheets showed an anticorrosive effect as a result of the hot-dip zinc-coating layer being dissolved by a sacrificial anode function, and ZnSO<sub>4</sub>·7H<sub>2</sub>O was formed in the simulated acid rain solution.
- Jitsumu Hyomen Gijutsu
Jitsumu Hyomen Gijutsu 59(4), 247-250, 2008-04-01
The Surface Finishing Society of Japan