| Project/Area Number |
17360416
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Naval and maritime engineering
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| Research Institution | Tokyo University of Marine Science and Technology |
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Principal Investigator |
TAKAMASA Tomoji Tokyo University of Marine Science and Technology, Faculty of Marine Technology, Professor, 海洋工学部, 教授 (20134851)
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| Co-Investigator(Kenkyū-buntansha) |
ISHIMARU Takashi Tokyo University of Marine Science and Technology, Faculty of Marine Science, Professor, 海洋科学部, 教授 (90114371)
MOTODA Shinichi Tokyo University of Marine Science and Technology, Faculty of Marine Technology, Associate Professor, 海洋工学部, 助教授 (10190969)
HAZUKU Tatsuya Tokyo University of Marine Science and Technology, Faculty of Marine Technology, Associate professor, 海洋工学部, 助教授 (60334554)
FURUYA Masahiro Central Research Institute of Electric Power Industry, Nuclear Technology Research Laboratory, Senior Researcher, 原子力技術研究所, 主任研究員 (80371342)
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| Project Period (FY) |
2005 – 2006
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| Project Status |
Completed (Fiscal Year 2006)
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| Budget Amount *help |
¥12,400,000 (Direct Cost: ¥12,400,000)
Fiscal Year 2006: ¥4,700,000 (Direct Cost: ¥4,700,000)
Fiscal Year 2005: ¥7,700,000 (Direct Cost: ¥7,700,000)
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| Keywords | marine engineering / conservation of ocean environment / marine building / corrosion control / material processing / radiation, radioactive rays / radioactive materials / Radiation Induced Surface Activation |
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| Research Abstract |
A corrosion mitigation technique based on radiation induced surface activation (RISA) from the gamma ray irradiation on a metal surface is reported in this paper. This study aimed to develop a RISA method to prevent crevice corrosion in SUS304 stainless steel using low-intensity radioactive material. Experiment showed that an electrode potential of -100 mV vs. Ag/AgCl was produced and maintained on TiO_2-coated SUS304 stainless steel specimens immersed in artificial seawater and in close contact with a small, sealed ^<60>Co source or activated by spontaneous neutron irradiation, with no corrosion observed for more than 7 days. On the contrary, the potential of the specimen without a radiation source decreased less than -280 mV vs. Ag/AgCl and crevice corrosion occurred beneath the O-ring within few days. The RISA effect of low-intensity radioactive material has the potential to prevent crevice corrosion of SUS304 stainless steel in actual seawater.
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