Corrosion Monitoring for Deep Underground Environment

深层地下环境腐蚀监测

• 批准号: 13650778
• 负责人: FUJIMOTO Shinji
• 金额: $ 1.98万
• 依托单位: Fukui University of Technology
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 2001
• 资助国家: 日本
• 起止时间: 2001 至 2002
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-13650778/
• 关键词: passivity; semiconductor; photo electrochemistry; stainless steels; surface modification; corrosion and protection; 紫外光; 耐食性; X線光電子分光

The surface of materials forms interface between bulk and environment, and exhibits various properties that are different from that of bulk material. Surface thin oxide films on metals and alloys isolate the internal materials from environment to prevent environmental degradation, and exhibit various chemical and physical function as interaction between environment. Using aqueous solution process, surface of materials is modified by various interactions to produce unique surface layer, exhibiting new chemical composition, ordered structure, functions.In the present work, modification of Ni and Ni-Cr alloys, Fe-Cr alloys by light irradiation, and electronic properties of passive film which is highly related with the light induced modification are discussed using photo electrochemical response and electrochemical impedance spectroscopy.Properties of passive films on Ni and Ni-18Cr formed in acid solution are characterised in order to discuss semiconductor properties of passive films. Mat … More erials were polarised in deaerated 0.1 kmol m-3 H2SO4 at various potentials for up to 24 hours. Photo current generated by irradiation of monochromated light, and capacitance by means of electrochemical impedance were measured for a series of potentials in less noble direction from the film formation potential. The passive films were also characterised using XPS.Passive film on Fe-18Cr formed in the neutral borate buffer solution was studied using an electrochemical impedance spectroscopy and a photo electrochemical response. The passive film is composed of inner oxide and covering hydroxide layer, both which exhibit n-type semiconductor property with band gap energy, Eg, of 3.4-3.5 eV and 2.4 eV, respectively. Electronic energy band structure model as bi-layer semiconductor was proposed based on the experimental results, considering the film structure presumed by XPS. The change of energy band structure by photo irradiation is also discussed which results in photo current transient and change in capacitance of space charge layer. The difference between passive film on Fe-Cr alloys formed in the neutral and acid solution was also discussed in terms of film growth kinetics and corrosion process. Less

材料的表面是体与环境的界面，表现出不同于体材料的各种性质。金属和合金表面的氧化膜是将材料内部与环境隔离以防止环境退化的一种有效手段，并在与环境的相互作用中表现出各种化学和物理功能。利用水溶液法，通过各种相互作用对材料进行表面改性，使其表面形成独特的表面层，呈现出新的化学组成、有序结构和功能，本文对Ni和Ni-Cr合金、Fe-Cr合金、利用光电化学响应和电化学阻抗等方法讨论了与光致改性密切相关的钝化膜的电子性质本文对Ni和Ni-18 Cr在酸性溶液中形成的钝化膜的性质进行了表征，以讨论钝化膜的半导体性质。垫 ...更多信息 在脱气的0.1kmolm-3 H2SO 4中，在不同的电位下，将样品极化长达24小时。通过单色光的照射产生的光电流，和电容的电化学阻抗的装置进行了测量，为一系列的电位在不太高贵的方向从膜形成电位。采用电化学阻抗谱和光电化学响应研究了Fe-18 Cr在中性硼酸盐缓冲溶液中形成的钝化膜。钝化膜由内氧化层和外氢氧化层组成，两者均具有n型半导体性质，带隙能量Eg分别为3.4- 3.5eV和2.4eV。根据实验结果，结合XPS推测的薄膜结构，提出了双层半导体的电子能带结构模型。讨论了光辐照引起能带结构的变化，从而引起光电流瞬态和空间电荷层电容的变化。从膜生长动力学和腐蚀过程两个方面讨论了铁铬合金在中性和酸性溶液中形成钝化膜的差异。少

项目成果

S.Fujimoto, H.Tsuchiya, M.Sakamoto, T.Shibata, K.Asami: "XPS, Impedance And Photo-Electrochemical Characterisation of Passive Films on Ni and Ni-18Cr Alloy in Sulphuric Acid Solution"Corrosion Science, A Retrospective and Current Status-In Honor of Robert

S.Fujimoto、H.Tsuchiya、M.Sakamoto、T.Shibata、K.Asami：“硫酸溶液中 Ni 和 Ni-18Cr 合金上钝化膜的 XPS、阻抗和光电化学表征”腐蚀科学，回顾性和

Hiroki Tsuchiya, Shinji Fujimoto, and Toshio Shibata: "Semiconductive behavior of passive films formed on Cr with various elements"Proceedings of 12th Asian Pacific Corrosion Control Conference, Seoul, 8-12 October 2001, The Corrosion Science Society of K

Hiroki Tsuchiya、Shinji Fujimoto 和 Toshio Shibata：“含各种元素的 Cr 上形成的钝化膜的半导体行为”第 12 届亚太腐蚀控制会议记录，首尔，2001 年 10 月 8-12 日，K 腐蚀科学学会

S. Fujimoto and T. Shibata: "Modification of Passive Films on Type304 Stainless Steel by Ultra-Violet Light Irradiation in the Neutral Chloride Solution"Proceedings of ECS/ISE Joint International Meeting, Corrosion and Protection, September 2-7, 2001, San

S. Fujimoto 和 T. Shibata：“在中性氯化物溶液中通过紫外光照射对 304 型不锈钢上的钝化膜进行改性”ECS/ISE 腐蚀与防护联合国际会议记录，2001 年 9 月 2-7 日，旧金山

Shinji Fujimoto, Hiroaki Tsuchiya, Mayuko Sakamoto, Toshio Shibata, Katsuhiko Asami: "XPS, Impedance And Photo-Electrochemical Characterisation of Passive Films on Ni and Ni-18Cr Alloy in Sulphuric Acid Solution"Corrosion Sciene, A Retrospective and Curre

Shinji Fujimoto、Hiroaki Tsuchiya、Mayuko Sakamoto、Toshio Shibata、Katsuhiko Asami：“硫酸溶液中 Ni 和 Ni-18Cr 合金上钝化膜的 XPS、阻抗和光电化学表征”腐蚀科学、回顾与现状

藤本慎司: "腐食に及ぼす光の作用と紫外光による不働態皮膜改質"材料と環境. 51・10. 453-457 (2002)

藤本真司：“光对紫外光钝化膜的腐蚀和改性的影响”材料与环境51・10（2002）。