摘要
采用静态失重法、动电位扫描法和交流阻抗法研究了高纯镁和AZ31合金在3.5%NaCl溶液中的腐蚀行为.结果表明:高纯镁在3.5%的NaCl溶液中的平均腐蚀速率要小于AZ31合金,腐蚀后在高纯镁表面形成了一层氧化膜,阻碍进一步腐蚀,而由于第二相与基体发生电化学反应的AZ31合金腐蚀过程继续维持.用SEM观察两者的腐蚀形貌发现,AZ31合金整个表面都被剧烈的腐蚀;而高纯镁表面腐蚀均匀,且腐蚀程度较浅.
Corrosion behavior of high-pure magnesium and AZ31 magnesium alloy in 3.5 % NaCl solution was studied by means of weight loss, dynamical potential scanning, and AC impedance. The results show that the average corrosion velocity of high-pure magnesium was lower than that of AZ31 alloy. A corrosion product scale formed on high-pure magnesium during corrosion, which then suppressed the corrosion process, but corrosion process of AZ31 alloy was going on, because electrochemical reaction continuously progressed between the matrix and the second phase. The corrosion appearance was observed with SEM, the whole surface of AZ31 alloy was corroded, with a rather heavy metal loss;the surface of high-pure magnesium was corroded uniformly but light metal loss.
出处
《腐蚀科学与防护技术》
CAS
CSCD
北大核心
2006年第2期98-100,共3页
Corrosion Science and Protection Technology
关键词
腐蚀
牺牲阳极
失重法
交流阻抗
corrosion
sacrificial anode
weight loss
AC impedance
