21203 水素燃料電池自動車用アルミニウム合金(材料の特性と組織(1),OS.6 材料の特性と組織)

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Fuel cell vehicles (FCVs) are expected as a promising way for preventing global warming. In the current FCVs, high-pressure (≦35MPa) hydrogen has been used as the fuel, which is contained in a tank composed of aluminum alloy (6061 alloy) liner and outer shell of carbon-fiber-reinforced plastic. Increasing the maximum pressure to 70MPa for increasing the mileage per filling is demanded, for which aluminum alloys with higher strength is needed for the liner. In order to guarantee the safety of a hydrogen tank, examination on the mechanical behavior and investigation on the hydrogen behavior of the candidate alloys in the high-pressure hydrogen are required. In this paper, some of the results of the NEDO (New Energy and Industrial Technology Development Organization) project-"Establishment of codes and standards for hydrogen economy society-Fuel cell vehicles, Distributed fuel cell system installed into houses, Hydrogen infrastructures-Basic Research on Aluminum-Based Materials for Hydrogen" will be described. To enhance the efficiency of the examination, SSRT (Slow Strain Rate Technique) tensile tests under air environments with controlled humidity was proposed as an alternative to the test under high-pressure hydrogen gas. This testing method was deduced to be effective to the material screening and to the assessment of the safety against hydrogen embrittlement, and a great deal of data were acquired by this alternative assessment method. Anti-hydrogen-embrittlement property of some alloys other than 6061 alloy has been assessed by means of the above method, and also fundamental investigation on the behavior of hydrogen intrusion and accumulation has been made by means of hydrogen microprint technique and thermal desorption spectroscopy correlating the hydrogen behavior with the test data on hydrogen embrittlement.
一般社団法人日本機械学会の論文
2009-03-05

21203 水素燃料電池自動車用アルミニウム合金(材料の特性と組織(1),OS.6 材料の特性と組織)

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