Investigation on the characteristics and mechanism of AZ80A magnesium alloy corrosion by Halon 1301 and CF_(3)I  

作　　者：Xin Huang Huilin Bai Yujia Huo Xiaomeng Zhou 

机构地区：[1]Center for Aircraft Fire and Emergency,Civil Aviation University of China,Tianjin 300300,PR China

出　　处：《Aerospace Traffic and Safety》2024年第1期73-83,共11页空天交通与安全（英文）

基　　金：supported by the Joint Funds of the National Natural Science Foundation of China“False alarm immunity fire detection mechanism and key technologies of civil aviation aircraft cargo compartment”[Grant No.U213320003];Science and Technology Program of Tianjin“Research on fire characteristics and advanced halo-carbon fire extinguishing technology of domestic civil aircraft”[Grant No.21JCZDJC00810].

摘　　要：In order to study the application of gas fire extinguishing agents in civil aircraft fire extinguishing systems,the corrosion characteristics and mechanisms of Halon 1301 and CF_(3)I on AZ80A magnesium alloy were comparatively analyzed.The experimental methods combined with density functional theory were applied to explore the corrosion mechanism.The results indicate that Halon 1301 and CF_(3)I exhibit good compatibility with AZ80A magnesium alloy through physical adsorption at room temperature and pressure,where Halon 1301 has a more stable adsorption configuration.However,with increasing temperature,pyrolysis reactions occur leading to the formation of fluorine containing corrosive substances which can react with magnesium alloy to generate the corrosion production of MgF_(2) and coke.Although MgF_(2) and coke can partically reduce reaction rates and protect against corrosion,the presence of MgF_(2) promotes further pyrolysis,generating more corrosion products.Consequently,the accumulation of corrosion products leads to a loss of metallic luster and a decline in mechanical properties of magnesium alloy along with interfacial cracking due to mutual extrusion between MgF_(2) and carbon deposition layers.These studies offer theoretical guidance for utilizing CF_(3)I in civil aircraft fire extinguishing systems while facilitating rapid screening for efficient clean gas extinguishing agents.

关 键 词：Gas fire extinguishing agents AZ80A magnesium alloy Corrosion products Corrosion mechanism CF_(3)I 

分 类 号：TG146.22[一般工业技术—材料科学与工程]