摘要
利用微电极原位测量技术和电化学噪声技术研究了5083和6061铝合金的缝隙腐蚀行为,探讨了材料的显微组织与缝隙腐蚀行为之间的相关性。结果表明,6061铝合金从缝口到缝隙内部局部腐蚀的趋势逐渐增强,对6061铝合金缝隙腐蚀起主导作用的是IR降机制;5083铝合金距缝口远处的腐蚀形态趋近局部腐蚀,距缝口近处趋近均匀腐蚀,缝隙内成分变化机制是5083铝合金缝隙腐蚀的主导因素。不同类型第二相的微电偶作用是5083和6061铝合金的缝隙腐蚀行为以及遵循的腐蚀机制不同的原因。
The crevice corrosion behavior of 5083 and 6061 aluminium alloys was investigated by electrochemical noise and in-situ measurement with microelectrode. The experimental results indi- cated that concerning the crevice corrosion process, 6061 alloy follows IR drop mechanism, while 5083 alloy follows critical solution composition theory. The corrosion of 5083 alloy was mainly uniform corrosion and transferred to severe localized corrosion with the increasing of crevice depth. But the 6061Alloy suffered from severe localized corrosion. The difference of corrosion be- havior between 5083 and 6061 aluminium slloys might be attributed to the presence of different in- termetallic phase for the two alloys.
出处
《腐蚀科学与防护技术》
CAS
CSCD
北大核心
2014年第2期125-131,共7页
Corrosion Science and Protection Technology
关键词
缝隙腐蚀
电化学噪声
铝合金
crevice corrosion, electrochemical noise （EN）, aluminum alloy
