摘要
在海洋气候环境中混合使用不同材料会形成电偶对加快结构腐蚀。对AE44/MS镁合金板件钢制螺栓连接结构在1.6%NaCl海洋大气环境中的腐蚀特性进行数值模拟,将大气环境中的相对湿度RH作为自变量,相对湿度分别取70%,75%,80%,85%,90%,95%。结果表明:AE44/MS结构材料接触区域镁合金板件侧电流密度变化最大,说明构成的电偶对加速了镁合金板件在大气环境中的腐蚀。随着相对湿度的增大,AE44/MS螺栓连接结构最大电流密度先增大后减小,在相对湿度RH=90%左右时,其最大电流密度可达到16.7 A/m^(2),其最快腐蚀速率可达40 mm/a。
The mixed use of different materials in marine climate environment will form galvanic pair to accelerate structural corrosion.Numerical simulation was conducted on the corrosion characteristics of AE44/MS magnesium alloy plate steel bolted connection structures in a 1.6% NaCl marine atmospheric environment. The relative humidity RH in the atmospheric environment was taken as an independent variable, and the relative humidity was 70%, 75%, 80%, 85%, 90%, and 95%, respectively. Results showed that the current density of magnesium alloy plate side in the contact area of AE44/MS structure material changed the most, indicating that the formed galvanic pair accelerated the corrosion of magnesium alloy plate in atmospheric environment. With the increase of relative humidity, the maximum current density of AE44/MS bolted connection structure increased first and then decreased. When relative humidity RH was 90%, the maximum corrosion current density could reach 16.7 A/m^(2), and the fastest corrosion rate was up to 40 mm/a.
作者
林齐叠
LIN Qidie(School of Mechanical and Automotive Engineering,Shanghai University of Engineering Science,Shanghai 201620,China)
出处
《材料保护》
CAS
CSCD
2023年第8期91-96,共6页
Materials Protection
关键词
AE44/MS结构
电化学腐蚀
相对湿度
海洋气候
数值模拟
AE44/MS structure
electrochemistry corrosion
relative humidity
marine climate
numerical simulation
