21202 水素マイクロプリント法によるアルミニウム中の水素の可視化 : 検出効率に及ぼす試料表面イオンプレーティング処理の影響(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 measure of 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. Further research and development are demanded to increase the maximum pressure to 70MPa for increasing the mileage per filling, for which aluminum alloys with higher strength is needed for the liner. However, hydrogen embitterment was reported to take place in a 7075 aluminum alloy when tensile-tested at a slow strain rate in a moist air. In order to guarantee the safety of a hydrogen tank, investigation on the hydrogen behavior in the high-strength aluminum alloys is required. Hydrogen microprint technique (HMPT) has been known to be an effective method to visualize the location of hydrogen emission with respect to the microstructure. In the HMPT, however, it is reported that the detection efficiency of hydrogen is only 1%, while it is markedly increased by ion-plating the specimen with Sn. In this research, sheets of pure aluminum with 99.99% purity were ion-plated with Sn and Ni, and attempts were made to find the optimum condition for the plating by closely examining the detection efficiency as well as the microstructure of the plated layer. Thermal desorption spectroscopy was also carried out on the plated specimen to elucidate whether some amount of hydrogen was contained in the plated layer which may disturb the apparent efficiency data.
2009-03-05

21202 水素マイクロプリント法によるアルミニウム中の水素の可視化 : 検出効率に及ぼす試料表面イオンプレーティング処理の影響(材料の特性と組織(1),OS.6 材料の特性と組織)

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