HFC-125/N_2混合气体对熔态AZ91D镁合金的保护行为研究  

Protection Behavior of HFC-125 and N_2 Mixture Gases for AZ91D Magnesium Alloys Melt

作　　者：张心灵[1,2] 游国强[1,3] 龙思远[1,3] 赵福全[2] 徐荣峰[2] 

机构地区：[1]重庆大学材料科学与工程学院,重庆400030 [2]浙江吉利汽车研究院有限公司,浙江杭州310000 [3]国家镁合金工程材料技术研究中心,重庆400030

出　　处：《铸造》2010年第9期936-939,共4页Foundry

基　　金：重庆市自然科学基金项目(CSTC2008BB4175);广东省重大科技专项(2008A090300004)

摘　　要：采用SEM、EDS、XRD和XPS等分析手段研究了HFC-125/N2混合气体对AZ91D镁合金熔体的保护效果,以及所形成的表面膜的形成过程。结果表明:HFC-125可以对镁熔体提供长期有效的阻燃保护;所得镁熔体表面膜主要由MgF2构成;随着时间的延长,表面膜内Mg含量逐渐减少,F含量逐渐增多。HFC-125 gas,one of the hydrogen fluoride hydrocarbon gases,can provide an effective protection for magnesium alloys during melting;however,the formation mechanism of protective film has not been well understood.The effect of HFC-125/N2 mixed gases on the melting magnesium alloys was investigated;the SEM,EDS,XRD and XPS analyses were also conducted to understand the formation of protective film.The results show that HFC-125 can serve as a long-term effective flame retardant for magnesium alloy melt;the protective film was mainly composed of MgF2.Mg concentration in the protective film decreases gradually while F concentration increases with the time.

关 键 词：保护气体 镁合金 SF6 HFC-125 MGF2 

分 类 号：TG292[金属学及工艺—铸造]