The evolution of hydrogen gas from the reaction between a series of atomised aluminium powder samples and 2.5 M HCl was monitored over time. The pattern of hydrogen evolution in each case was similar in that after an initial period of slow gas production there was a rapid increase followed by slow gas production again. These studies also showed differences in the time taken to reach maximum hydrogen evolution for similarly aged powders. Lower purity aluminium powder (99.7 vs. 99.93%) or samples with a higher proportion of smaller particles reached the maximum rate of hydrogen evolution more quickly. Changes in the time taken to reach maximum gas evolution were also noted for all the powders as they aged; the time to reach a maximum generally increasing with time after atomisation. However, for each powder a short regression occurred between ca. 21 and 35 d. This suggests that changes continue to take place in the surface layer of the aluminium particulates long after atomisation has taken place.
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机译：随时间监测氢气在一系列雾化的铝粉样品和2.5 M HCl之间的反应放出。在每种情况下，析氢的模式都相似，因为在缓慢产生气体的初始阶段之后，气体迅速增加，随后又缓慢产生气体。这些研究还表明，对于类似老化的粉末，达到最大氢释放所需的时间有所不同。较低纯度的铝粉（99.7对99.93％）或较小颗粒比例较高的样品更快地达到了最大的氢释放速率。还注意到所有粉末随着时间的流逝达到最大气体释放所需时间的变化。达到最大值的时间通常随着雾化后的时间而增加。但是，对于每一种粉末，在大约30到200之间发生了短暂的回归。 21和35 d。这表明在雾化发生很长时间之后，铝颗粒表面层中的变化仍继续发生。
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