Nanoscale Analysis of [Steel/Ion] Reaction using SPring-8 Synchrotron Radiation

使用 SPring-8 同步辐射对 [钢/离子] 反应进行纳米级分析

• 批准号: 15560628
• 负责人: YAMASHITA Masato
• 金额: $ 2.24万
• 依托单位: University of Hyogo (2004-2005)Himeji Institute of Technology (2003)
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 2003
• 资助国家: 日本
• 起止时间: 2003 至 2005
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-15560628/
• 关键词: Synchrotron Radiation; Corrosion; Steel; Ion; Corrosion Product; Rust; In Situ Observation; Nano Structure

Even if infrastructure is especially needed in the 21^<st> century, it becomes difficult to maintain steel structure forming infrastructure due to 高齢化・財政危機. However, corrosion protection for apparatus, steel structure, plant and traffic system costs as large as 4000 billion yen in Japan. It is really necessary now to 確保 long-term life for steel structure for reducing the maintenance cost which is now increasing every year, so that 国家使命 to restructure and reduce 経済負担 will be 戦略的に realized. For this purpose, we should 対応策を構築 by understanding basic of corrosion degradation occurred by correlation between corrosion species and steel materials.In this study, in order to understand corrosion degradation mechanism of steel materials, in situ observation of corrosion degradation and nano-structure analysis for corrosion product have been performed on steels using SPring-8 and Photon Factory synchrotron radiation X-rays. Reaction between iron ion and other alloying and environmental chemicals o … More n the steel surface and structure of corrosion product have been analyzed in terms of X-ray diffraction and X-ray absorption fine structure spectroscopies.By X-ray absorption fine structure measurements, we found that 1) Cr as an alloying element is in goethite, which decreases goethite crystal size and increase protective ability of rust layer of steel, 2) Ni ion dissolved from steel is in a certain site of akaganeite and/or spinel type oxide in rust layer and decreases corrosion reaction in the environment with chloride ion, 3) the relative amount of each iron oxide in rust changes with environmental condition and with amount of alloying element, 4) chloride ion in the environment affect the structure of rust layer.In situ observation of corrosion process on steels revealed that the ion species in electrolyte layer covering steel surface control the corrosion process and rust formation process. The rust formation processes of steels with different alloying contents were clarified by this in situ measurement.These results obtained in this study indicate that alloying elements and environmental ion species greatly affect the structure and protective ability of the rust layer formed on the steel surface. Less

Even if infrastructure is especially needed in the 21st century<st>, it becomes difficult to maintain steel structure forming infrastructure due to high inflation·financial crisis. However, corrosion protection for apparatus, steel structure, plant and traffic system costs as large as 4000 billion yen in Japan. It is really necessary now to ensure long-term life for steel structure for reducing the maintenance cost which is now increasing every year, so that the national mission to restructure and reduce the maintenance cost will be realized. For this purpose, we should construct a strategy by understanding basic of corrosion degradation occurred by correlation between corrosion species and steel materials.In this study, in order to understand corrosion degradation mechanism of steel materials, in situ observation of corrosion degradation and nano-structure analysis for corrosion product have been performed on steels using SPring-8 and Photon Factory synchrotron radiation X-rays. Reaction between iron ion and other alloying and environmental chemicals o … More n the steel surface and structure of corrosion product have been analyzed in terms of X-ray diffraction and X-ray absorption fine structure spectroscopies.By X-ray absorption fine structure measurements, we found that 1) Cr as an alloying element is in goethite, which decreases goethite crystal size and increase protective ability of rust layer of steel, 2) Ni ion dissolved from steel is in a certain site of akaganeite and/or spinel type oxide in rust layer and decreases corrosion reaction in the environment with chloride ion, 3) the relative amount of each iron oxide in rust changes with environmental condition and with amount of alloying element, 4) chloride ion in the environment affect the structure of rust layer.In situ observation of corrosion process on steels revealed that the ion species in electrolyte layer covering steel surface control the corrosion process and rust formation process. The rust formation processes of steels with different alloying contents were clarified by this in situ measurement.These results obtained in this study indicate that alloying elements and environmental ion species greatly affect the structure and protective ability of the rust layer formed on the steel surface. Less

项目成果

Characterization of Rust Layer Formed on Fe, Fe-Ni and Fe-Cr Alloys, Exposed to C1-Rich Environment by C1 and Fe K-Edge XANES Measurements

通过 C1 和 Fe K-Edge XANES 测量表征暴露于富含 C1 环境的 Fe、Fe-Ni 和 Fe-Cr 合金上形成的锈层

• 发表时间: 2005
• 期刊: Materials Transactions 46・2
• 作者: Hiroyuki Konishi et al.

Difference between Cr and Ni K-Edge XANES Spectra of Rust Layer Formed on Fe-Based Binary Alloys Exposed to Cl-Rich Environments

暴露于富 Cl 环境的铁基二元合金上形成的锈层的 Cr 和 Ni K 边缘 XANES 光谱的差异

• 发表时间: 2005
• 期刊: Materials Transactions 46, No.1
• 作者: H.Konishi;M.Yamashita;H.Uchida;J.Mizuki
• 通讯作者: J.Mizuki

Formation process of atmospheric rust layer on Fe-based binary alloys

铁基二元合金大气锈层的形成过程

• 发表时间: 2005
• 期刊: Current Advances in Materials and Processes 18
• 作者: M.Yamashita;H.Konishi;T.Kozakura;J.Mizuki;H.Uchida;Masato Yamashita;Masato Yamashita;Hiroyuki Konishi;Masato Yamashita;Masato Yamashita
• 通讯作者: Masato Yamashita

C1 K-Edge XANES Spectra of Atmospheric Rust on Fe, Fe-Cr and Fe-Ni, Alloys Exposed to Saline Environment

暴露于盐环境的 Fe、Fe-Cr 和 Fe-Ni 合金上的大气锈的 C1 K-Edge XANES 光谱

• 发表时间: 2004
• 期刊: Materials Transactions 45・12
• 作者: M.Yamashita;H.Konishi;T.Kozakura;J.Mizuki;H.Uchida;Masato Yamashita;Masato Yamashita;Hiroyuki Konishi;Masato Yamashita;Masato Yamashita;Masato Yamashita et al.;Hiroyuki Konishi et al.
• 通讯作者: Hiroyuki Konishi et al.

Structure Analysis of Cation Selective Cr-goethite as Protective Rust of Weathering, Steel

阳离子选择性铬针铁矿作为钢风化防锈剂的结构分析

• 发表时间: 2005
• 期刊: Materials Transactions 46・2
• 作者: Hiroyuki Konishi et al.;Hiroyuki Konishi et al.;Hiroyuki Konishi et al.
• 通讯作者: Hiroyuki Konishi et al.