利用3种实验方法,研究了SO2/Air/N2气氛对纯Mg及AZ91D合金熔体的保护行为,运用x射线衍射仪(XRD)、扫描电镜(SEM)、能谱仪(EDS)、Auger电子能谱仪(AES)和X射线光电子能谱仪(XPS)分析了形成的表面膜的相组成、微观组织形貌和生长过程,结合热力学计算讨论了表面膜的生长与保护机理,并考查了表面膜的稳定性.研究表明:在SO2/Air/N2气氛中,保护性表面膜由MgO,MgS和MgSO4混合组成,MgSO4是热力学稳定相,它的形成至关重要.当采用SO2/Air/N2气氛为保护气氛且SO2含量一定时,Air含量不能过高也不能过低.
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