典型超强耐热镁合金部件服役环境寿命仿真分析  

Service Environmental Life Simulation Analysis of Typical Ultra Strong Heat⁃Resistant Magnesium Alloy Components

作　　者：黄有旺[1] 孙晓玲 杨文锦 陈慧 HUANG Youwang;SUN Xiaoling;YANG Wenjin;CHEN Hui(Beijing Institute of Space Long March Vehicle,Beijing 100076,China;Science and Technology on Space Physics Laboratory,China Academy of Launch Vehicle Technology,Beijing 100076,China;Sichuan Aerospace Changzheng Equipment Manufacturing Co.,Ltd.,Chengdu 610100,China;Shanghai Gelinbei Technology Development Co.,Ltd.,Shanghai 201100,China)

机构地区：[1]北京航天长征飞行器研究所,北京100076 [2]中国运载火箭技术研究院空间物理重点实验室,北京100076 [3]四川航天长征装备制造有限公司,四川成都610100 [4]上海格麟倍科技发展有限公司,上海201100

出　　处：《材料保护》2023年第12期7-11,18,共6页Materials Protection

摘　　要：为研究镁合金在航天飞行器上应用的可行性以及耐腐性能,首先通过电化学试验测得HTM1(航天1号镁合金)与TC4(钛合金)的极化数据,以及HTM1专用电泳漆的阻抗数据,然后采用模拟仿真技术,以极化数据、阻抗数据、老化数据和服役环境为边界条件,仿真分析不同典型超强耐热镁合金结构件在不同服役环境下(服役环境1为0.2 mg/L NaCl盐雾浓度,服役环境2为2.0 mg/L NaCl盐雾浓度)分别服役5.0、10.0和17.5 a后的腐蚀状态。结果表明:在服役环境1和服役环境2的服役过程中,随着服役年限的延长,电泳漆保护性能下降,导致HTM1对TC4的保护效应逐渐增强,但受HTM1表面防护层的影响,保护效果有限,导致TC4也发生一定程度腐蚀;同时,2种结构件中钛⁃镁电偶对的接触面积不同,造成TC4的受保护程度也不相同,二者的接触面积越大,TC4受保护程度越高。To study the feasibility of magnesium alloys used in aerospace vehicles and its corrosion resistance,the polarization data of HTM1(Aerospace No.1 magnesium alloy)and TC4(titanium alloy)were firstly measured through electrochemical tests,as well as the impedance data of HTM1 specialized electrophoretic paint.Subsequently,the simulation technology with polarization data,impedance data,aging data and service environment as boundary conditions was utilized to simulate and analyze the corrosion status of different typical ultra strong and heat⁃resistant magnesium alloy structural components in different service environments(service environment 1 with a salt mist concentration of 0.2 mg/L,and service environment 2 with a salt mist concentration of 2 mg/L)after 5.0,10.0 and 17.5 a of service,respectively.Results showed that during the service process in service environment 1 and service environment 2,with the extension of service life,the protective perform⁃ance of the electrophoretic paint decreased,leading to a gradual enhancement of the protective effect of HTM1 on TC4.However,due to the influence of the surface protective layer of HTM1,the protective effect was limited,leading to a certain degree of corrosion of TC4.Meanwhile,the contact area of the titanium magnesium couple in the two structural components was different,resulting in different degrees of protection for TC4.The larger the contact area between the two,the higher the degree of protection for TC4.

关 键 词：镁合金 腐蚀仿真 服役寿命 TC4合金 

分 类 号：TG174.4[金属学及工艺—金属表面处理]