摘要
目的进一步验证高强铝合金在极寒环境中加速试验谱的合理性,并深入探讨其腐蚀机理,进行系统研究。方法基于此前研究的高强铝合金加速试验环境谱,开展长周期腐蚀试验。采用腐蚀质量损失速率测试、腐蚀产物表面与截面形貌观察、腐蚀产物成分分析以及三维点蚀参数分析等手段,对长周期加速腐蚀试验后高强铝合金的腐蚀机理进行综合分析。结果2024和7075铝合金在加速腐蚀5个周期后,质量损失速率分别为16、9 g/(m·a),腐蚀产物主要为AlOOH和Al_(2)O_(3)。相较于7075铝合金,2024铝合金明显多出了红色腐蚀产物,其较高的铜含量可能是产生红色腐蚀产物的关键因素之一。结论冰层下的薄液膜为铝合金腐蚀提供了必要的湿润介质,极寒环境中的冻融循环导致冰层下氯离子富集,进而促进点蚀的萌生与扩展。
The work aims to further verify the reasonableness of the accelerated test spectrum of high-strength aluminum alloy in extremely cold environment,and to explore its corrosion mechanism in depth for systematic research.Based on the pre-viously studied accelerated test environment spectrum of high-strength aluminum alloy,a long-cycle corrosion test was carried out.The corrosion mechanism of high-strength aluminum alloys after the long-cycle accelerated corrosion test was comprehen-sively analyzed by means of corrosion mass loss rate test,surface and cross-section morphological observation of corrosion products,corrosion product composition analysis,and three-dimensional pitting parameter analysis.The mass loss rates of 2024 and 7075 aluminum alloys after five cycles of accelerated corrosion were 16 g·m^(–2)/a and 9 g·m^(–2)/a,respectively,and the corro-sion products were mainly AlOOH and Al_(2)O_(3).Compared with 7075 aluminum alloy,2024 aluminum alloy significantly has more red corrosion products.Its higher copper content may be one of the key factors for the formation of red corrosion products The thin liquid film under the ice layer provides the necessary wetting medium for the corrosion of aluminum alloys.Freeze-thaw cycles in the extremely cold environment lead to the enrichment of chloride ions under the ice layer,which in turn promotes the emergence and expansion of pitting corrosion.
作者
白玉洁
孟迪
李新义
吴昊
田会云
崔中雨
BAI Yujie;MENG Di;LI Xinyi;WU Hao;TIAN Huiyun;CUI Zhongyu(School of Materials Science and Engineering,Ocean University of China,Shandong Qingdao 266100,China;Foshan Sanshui Fenglv Aluminum Industry Co.,Ltd.,Guangdong Foshan 528133,China;College of Electrical and Mechanical Engineering,Qingdao University,Shandong Qingdao 266071,China)
出处
《装备环境工程》
2025年第8期1-13,共13页
Equipment Environmental Engineering
基金
国家自然科学基金:面上项目(52371080)。
关键词
高强铝合金
极寒环境
加速试验
大气腐蚀
点蚀
腐蚀机理
high-strength aluminum alloy
extreme cold environment
accelerated test
atmospheric corrosion
pitting
cor-rosion mechanism
