Behavior of hydrogen in aluminum exposed in different atmospheres
Behavior of hydrogen in aluminum exposed in different atmospheres
复制标题
铝在不同气氛下的氢行为
DOI：
10.2464/jilm.60.433
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发表时间：
2010
期刊：
影响因子：
--
通讯作者：
G. Itoh
中科院分区：
文献类型：
--
作者：
Takahiro Shikagawa;G. Itoh
铝合金中的氢经常导致产品的机械性能和表面质量退化。因此，氢在铝中的行为得到了广泛的研究。然而，当氢暴露在潮湿的空气中时，是否会侵入铝，一直存在明显的争议。在本研究中，用热脱附谱(TDS)分析了脱氢后的纯铝箔在室温到550°C的温度范围内主要暴露在空气中的氢行为。在室温下暴露于空气和水中的样品中，TDS谱在高于450°C的温度下清楚地观察到氢气的析出。这意味着样品表面的水分通过与铝的反应转化为原子氢，然后扩散到样品中，并被某些位置捕获。此外，样品在不同的温度和湿度下进行了1h的热处理。在不同温度和湿度下暴露于空气中的样品中，样品中的氢量随着湿度和温度的增加而增加。含有大量氢的样品在450℃和550℃左右出现两个峰，分别对应于位错捕获的氢和微孔捕获的氢。
Hydrogen in aluminum alloys frequently causes degradation of mechanical properties and surface quality of the prod-ucts. Thus, the behavior of hydrogen in aluminum has been extensively studied. However, there has been an appreciable controversy in whether hydrogen intrudes the aluminum when exposed to air with moisture. In this study, hydrogen behavior in a pure aluminum foil that had been dehydrogenated and subsequently exposed to mainly air at temperatures ranging from room temperature to 550°C was analyzed by means of TDS, thermal desorption spectroscopy. In the specimens exposed to air and water at room temperature, hydrogen evolution was clearly observed at temperatures above about 450°C in the TDS spectra. This means that moisture at the specimen surface was converted to atomic hydrogen through the reaction with aluminum which subsequently diffuses into the specimen and is trapped by certain sites. Additionally, the specimens were annealed at several temperatures and humidities for 1h. In the specimens exposed to air at different temperatures and humidity, the amount of hydrogen contained in the specimens was increased as the humidity and the temperature. Two peaks were seen at about 450 and 550°C in the spectra of the specimens containing large amount of hydrogen, and were found to correspond to the hydrogen trapped by dislocations and micro pores, re-spectively.