摘要
针对中性盐雾环境中2A12和7B04铝合金在不同暴露面积(模拟铝合金表面涂层或者膜层破坏暴露的部分)的点腐蚀特征开展研究,测量观察不同情况下铝合金的点腐蚀坑开口面积、腐蚀深度和点腐蚀坑数量等腐蚀参数。研究表明,在中性盐雾环境中,当暴露面积小于25mm2时,2A12和7B04铝合金的点腐蚀坑最大开口面积随暴露面积的增大而增大;当暴露面积小于4mm2时,2A12铝合金的最大腐蚀深度随着暴露面积的增大而增大,而7B04铝合金的最大腐蚀深度在暴露面积小于100mm2时随着暴露面积的增大而增大。对腐蚀产物进行成分分析可知2A12铝合金的腐蚀产物主要由O,Al,Mg,Cu组成,而7B04铝合金的腐蚀产物主要由O,Al,Mg,Zn组成,腐蚀产物组成不同造成其结构不同,结构的差别使铝合金的点腐蚀行为受到不同的影响。
The pitting corrosion characteristics of high strength aluminum alloys（2A12 and 7B04） with different exposed areas（simulating the destructive section of coatings or film on the aluminum alloy surface） by neutral salt spray test were investigated.The corrosion area,pitting depth and pitting quantity were measured.The results show that pitting corrosion of 2A12 and 7B04 aluminum alloys are accelerated with the increase of exposed area in the neutral salt spray test.The maximum corrosion area of aluminum alloys increases with the exposed areas when it is less than 25mm2;Moreover,the maximum pitting depth of 2A12 increases with exposed areas when it is less than 4mm2,while the maximum pitting depth of 7B04 increases with exposed areas when it is less than 100mm2.Component analysis of corrosion products indicates that the main components of corrosion products of 2A12 aluminum alloy are O,Al,Mg,Cu,while the corrosion products of 7B04 aluminum alloy are mainly O,Al,Mg,Zn.The different compositions of corrosion products causes their different structures,so that the pitting corrosion behavior of aluminum alloys is different.
出处
《航空材料学报》
EI
CAS
CSCD
北大核心
2010年第4期59-64,共6页
Journal of Aeronautical Materials
关键词
腐蚀
暴露面积
形貌
铝合金
corrosion
exposed area
morphology
aluminum alloy
