A1060纯Al在模拟污染海洋大气环境中的腐蚀行为及机理  

Corrosion Behavior and Mechanism of Pure Al A1060 in Simulated Polluted Marine Atmospheric Environment

作　　者：夏晓健 万芯瑗 刘海霞 严康骅 韩纪层 陈奕扬 XIA Xiaojian;WAN Xinyuan;LIU Haixia;YAN Kanghua;HAN Jiceng;CHEN Yiyang(State Grid Fujian Electric Power Co.,Ltd.Electric Power Research Institute,Fuzhou 350007,China;Hisense Visual Technology Co.,Ltd.,Qingdao 266000,China;Institute for Advanced Materials&Technology,University of Science and Technology Beijing,Beijing 100083,China)

机构地区：[1]国网福建省电力有限公司电力科学研究院,福州350007 [2]海信视像科技股份有限公司,青岛266000 [3]北京科技大学新材料技术研究院,北京100083

出　　处：《腐蚀与防护》2024年第6期36-43,共8页Corrosion & Protection

基　　金：国网福建省电力有限公司科技项目(52130421N003)。

摘　　要：通过周期浸润加速腐蚀试验和电化学测试,采用3.5%(质量分数)NaCl和3.5%NaCl+0.02 mol/L NaHSO_(3)溶液分别模拟海洋大气环境和污染海洋大气环境,研究了A1060纯Al在这两种环境中的腐蚀行为。结果表明:A1060纯Al在污染海洋大气环境中表现出更大的腐蚀电流密度和更低的自腐蚀电位,分别为1.01μA/cm^(2)和-911 mV;经720 h周期浸润腐蚀试验后,其在模拟污染海洋大气环境中的质量损失量和腐蚀速率分别为9.7 g/m^(2)和0.04μm/a,其腐蚀速率是在模拟海洋大气环境中的4倍,且其在污染海洋大气环境中还面临着更早和更加严重的点蚀情况;污染海洋大气中的HSO_(3)^(-)诱导A1060纯Al表面保护性氧化膜转变成疏松的Al_(2)(SO_(4))_(3),导致薄液膜的酸性和导电性均增加,从而促进腐蚀反应的发生。The corrosion behavior of pure Al A1060 in 3.5%(mass fraction)NaCl and 3.5%NaCl+0.02 mol/L NaHSO_(3)solutions which simulated polluted marine atmospheric enrironment was studied by cyclic immersion accelerated corrosion test and electrochemical test.The results show that the pure Al exhibited higher corrosion current density and lower free corrosion potential in polluted marine atmospheric environment,which were 1.01μA/cm^(2)and-911 mV,respectively.After 720 h periodic immersion corrosion test,the mass loss and corrosion rate of the pure Al in the simulated polluted marine atmosphere were 9.7 g/m^(2)and 0.04μm/a,respectively.The corrosion rate of the pure Al was 4 times higher than that in the simulated marine atmosphere,and it also faced earlier and more serious pitting corrosion in the polluted marine atmosphere.The HSO_(3)^(-)in the polluted marine atmosphere induced the protective oxide film on the surface of A1060 pure Al to transform into loose Al_(2)(SO_(4))_(3),resulting in the increase of the acidity and conductivity of the thin liquid film,thus promoting the occurrence of corrosion reaction.

关 键 词：A1060纯Al 污染海洋大气 腐蚀行为 电化学 

分 类 号：TG174[金属学及工艺—金属表面处理]