Abstract
Fuel cell vehicles (FCVs) are expected as a measure of preventing global warming. In the current_FCVs, high-pressure (35MPa) hydrogen has been being used as the fuel, being contained in a tank composed of 6061 aluminum-alloy liner, but further research and development are demanded to increase the maximum pressure to 70MPa for increasing the mileage per filling. In order to guarantee the safety of a hydrogen tank, the investigation on the hydrogen behavior in the aluminum are required. Hydrogen microprint technique (HMPT) has been known to be effective to investigate the behavior of hydrogen. In the HMPT, 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, a sheet of pure aluminum with 99.99% purity were ion-plated with Sn and Ni, and attempts were made to find the optimum condition of the plating by closely examining the detection efficiency as well as the microstructure of the plated layer.
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