A Microelectrochemical Approach to Understanding Hydrogen Absorption into Steels and Prevention Technique against Hydrogen Embrittlement by Surface Modification
| Project/Area Number |
25630319
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| Research Category |
Grant-in-Aid for Challenging Exploratory Research
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| Allocation Type | Multi-year Fund |
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| Research Field |
Material processing/Microstructural control engineering
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| Research Institution | Tohoku University |
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Principal Investigator |
MUTO Izumi 東北大学, 工学(系)研究科(研究院), 教授 (20400278)
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| Co-Investigator(Kenkyū-buntansha) |
SUGAWARA Yu 東北大学, 大学院工学研究科, 助教 (40599057)
HARA Nobuyoshi 東北大学, 大学院工学研究科, 教授 (40111257)
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| Project Period (FY) |
2013-04-01 – 2015-03-31
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| Project Status |
Completed (Fiscal Year 2014)
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| Budget Amount *help |
¥4,030,000 (Direct Cost: ¥3,100,000、Indirect Cost: ¥930,000)
Fiscal Year 2014: ¥1,820,000 (Direct Cost: ¥1,400,000、Indirect Cost: ¥420,000)
Fiscal Year 2013: ¥2,210,000 (Direct Cost: ¥1,700,000、Indirect Cost: ¥510,000)
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| Keywords | 材料加工・処理 / 腐食防食 / 水素侵入 / 浸炭 / 介在物 |
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| Outline of Final Research Achievements |
A small Devanathan-Stachurski cell was newly designed to ascertain the hydrogen absorption behavior into steels during corrosion. On a small area with MnS inclusions, the current of hydrogen permeation increased sharply when the NaCl solution was placed on the steel surface. On the other hand, no permeation current was observed on the area without the inclusions. MnS inclusions were likely to accelerate the steel dissolution and the hydrogen adsorption into the steel.
Type 304 stainless steel was subjected to low-temperature carburizing treatment to add excess interstitial carbon to its surface. No pitting was initiated on the carburized steel in NaClsolutions. It was clarified that the carburizing treatment inhibits the active dissolution rate of the steel matrix to about one hundredth. The carburization treatment was likely to suppress the hydrogen adsorption into the steels.
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Report
(3 results)
Research Products
(12 results)
