The mechanisms involved in premixed magnesium and hydrogen hybrid and synthetic MgH₂ dust cloud explosions were investigated. The results revealed that trace amounts of H₂ in Mg explosions can markedly increase explosion severity. Furthermore, H₂ addition can weaken the influence of oxygen deficiency on Mg explosion. Moreover, the explosion intensity of synthetic MgH₂ was far stronger than that of premixed Mg/H₂ mixture or Mg alone because the vacancy defects in Mg and H atoms can form after dehydrogenation of MgH₂, which caused that Mg and H₂ are prone to oxidation and nitrification in air atmosphere at a low temperature, thereby promoting the explosion. This demonstrates that the explosion risk of MgH₂ (even other H₂ storage materials) is related to its H₂ storage capacity and dehydrogenation temperature. Therefore, for H₂ storage materials, the better H₂ storage performances can exhibit higher explosion risks.

中文翻译：

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MgH2基储氢材料中的粉尘云爆炸特征及机理

研究了预混镁氢混合和合成MgH ₂尘埃云爆炸的机制。结果表明，镁爆炸中痕量的H ₂可以显着增加爆炸的严重性。此外，H ₂添加可以减弱缺氧对镁爆炸的影响。此外，合成 MgH ₂的爆炸强度远强于预混 Mg/H ₂混合物或单独的 Mg，因为 MgH ₂脱氢后会形成 Mg 和 H 原子的空位缺陷，导致 Mg 和 H ₂在低温空气气氛中容易发生氧化和硝化，从而促进爆炸。这表明MgH ₂（甚至其他H ₂存储材料）的爆炸风险与其H ₂存储容量和脱氢温度有关。因此，对于H ₂储存材料，较好的H ₂储存性能可以表现出更高的爆炸风险。