IN-SITU OBSERVATION AT SURFACE AND INTERFACE WITH LOCALIZED CORROSION PROCESS BY MEANS OF MICRO-RAMAN SPECTROSCOPY -SECM-AFM SYSTEM

显微拉曼光谱-SECM-AFM系统对表面和界面局部腐蚀过程进行原位观察

• 批准号: 07455283
• 负责人: MISAWA Toshihei
• 金额: $ 4.48万
• 依托单位: MURORAN INSTITUTE OF TECHNOLOGY
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (B)
• 财政年份: 1995
• 资助国家: 日本
• 起止时间: 1995 至 1996
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-07455283/
• 关键词: SCANNING ELECTROCHEMICAL MICROSCOPY; IN-SITU OBSERVATION; PITTING CORROSION; HIGH NITROGEN STAINLESS STEEL; TRITIUM AUTORADIOGRAPHY; HYDROGEN DISTRIBUTION; トリチウムオートラジオグラフ法; 水素分布可視化; 孔食発生; 顕微レーザラマン分光; 水素イオン分布; 塩素イオン分布; 不動態皮膜破壊

We have successfully performed in-situ observation of the localized distribution of reaction species of H^+ and Cl^- in microscopic region (1mum*emum) focused on the electrolyte solution side and identifying precursor sites for pitting on the substrate surface of austenitic stainless steels with different corrosion resistance by using the three modes of modified scanning electrochemical microscopy (SECM). Using in-situ Raman spectroscopy nitrate ions at the pit precursor region are identified for the first time. Tritium E.M.autoradiography and hydrogen content measurement are carried out to examine the effect of boron addition on the behavior of hydrogen segregation at the grain boundary in Ni_3 (Si, Ti) intermetallic.

利用改进的扫描电化学显微镜（SECM）的三种模式，成功地对不同耐蚀性奥氏体不锈钢基体表面H^+和Cl^-反应物种在电解质溶液侧（1 μ m *emum）的局部分布进行了原位观察，并确定了点蚀的前驱位点。利用原位拉曼光谱首次确定了在坑前体区域的硝酸根离子。用氚电磁辐射自显影和氢含量测量研究了硼对Ni_3（Si，Ti）金属间化合物晶界氢偏聚行为的影响。

项目成果

H.Saitoh: "Suppression of hydrogen segregation at grain boundary by boron addition in Ll_2-type Ni_3(Si,Ti)allov" J.Mater.Sci.Lett.15. 1297-1299 (1996)

H.Saitoh：“通过在 Ll_2 型 Ni_3(Si,Ti)allov 中添加硼来抑制晶界处的氢偏析”J.Mater.Sci.Lett.15。

H.Tanabe: "Cathodic behavior of boron and chromium added Ni_3 (Si,Ti) intermetallics having high resistance to hydrogen-induced embrittlement" Intermetallics. 4(印刷中). (1996)

H.Tanabe：“具有高抗氢致脆性的硼和铬添加的 Ni_3 (Si,Ti) 金属间化合物的阴极行为”金属间化合物 4（出版中）。

T.Misawa: "In-situ observation of dynamic reacting species at pit precursors of N-bearing austenitic stainless steels" ISIJ International. 36・7. 787-792 (1996)

T. Misawa：“含氮奥氏体不锈钢坑前体动态反应物种的现场观察”ISIJ International 36・7（1996）。

H.Saitoh: "Suppression of hydrogen segregation at grain boundary by boron addition in Ll_2-type Ni_3 (Si, Ti) alloy" J. Mater. Sci. Lett.15. 1297-1299 (1996)

H.Saitoh：“Ll_2 型 Ni_3 (Si, Ti) 合金中添加硼对晶界氢偏析的抑制”J. Mater。

H.Saitoh: "Hydrogen distribution in Co_3Ti intermetallic compound by tritium electron microautoradiography" J. Mater. Sci. Lett.15. 23-25 (1996)

H.Saitoh：“氚电子显微放射自显影法在 Co_3Ti 金属间化合物中的氢分布”J. Mater。