高铁散热器用3003铝合金焊接隔板的腐蚀机理研究
Corrosion Behavior of Welded Partitions of 3003 Al-alloy Used for Radiators of High-speed Train
巫海亮 1陈宇强 1黄亮 2顾宏宇 2孙宏博 1刘佳俊 1王乃光 3宋宇峰1
作者信息
- 1. 湖南科技大学高功效轻合金构件成形技术及耐损伤性能评价湖南省工程研究中心 湘潭 411201
- 2. 株洲时代金属制造有限公司 株洲 412200
- 3. 广东工业大学材料与能源学院 广州 510006
- 折叠
摘要
采用X射线荧光光谱(XRF)、扫描电镜(SEM)、电化学阻抗谱(EIS)和极化曲线分析了实际环境中的沉积粉尘对高铁散热器用3003铝合金焊接隔板腐蚀行为的影响机理,并建立了铝合金焊接隔板的腐蚀深度预测模型.结果表明,在粉尘溶液环境中,铝合金焊接隔板在腐蚀初期以点蚀为主,随后演变为沿晶腐蚀.铝合金焊接隔板的主要腐蚀产物为Al(OH)3和AlCl3.铝合金焊接隔板经粉尘溶液全浸180 d后,腐蚀电位下降了24.5％,腐蚀电流密度提高了 156.7％.结合全浸实验和实际服役8 a的构件腐蚀深度测试结果,建立了高铁散热器用铝合金焊接隔板最大腐蚀深度预测模型.
Abstract
The corrosion behavior of welded partitions of 3003 Al-alloy,used for radiators of high-speed train,in artificial solution of settling dust,which aims to simulate the synergistic ation of the settling dusts and rains on the partitions in the real service,was studied by means of immersion test,polarization curve measurement,X-ray fluorescence(XRF),scanning electron microscopy(SEM),and electrochemi-cal impedance spectroscopy(EIS).Meanwhile,the relevant prediction model for the corrosion depth of welded partitions was established.The results show that,the pitting corrosion is dominant at the initial stage of corrosion,and then gradually evolves into intergranular corrosion.The main corrosion products of welded partitions are Al(OH)3 and AlCl3.In comparison with those of the as received ones,the corro-sion potential of welded partitions after immersion for 180 d decreases by 24.5％and the corrosion cur-rent density increases by 156.7％.A prediction model for the maximum corrosion depth of welded parti-tions was established based on data of the immersion test results and the measured corrosion depth of the very welded partitions after 8 a of live vehicle service.
关键词
3003铝合金/耐蚀性/腐蚀机理/腐蚀模型/腐蚀深度预测模型Key words
3003 Al-alloy/corrosion-resistance/corrosion behavior/corrosion model/corrosion depth prediction model引用本文复制引用
基金项目
国家自然科学基金(52075166)
国家自然科学基金(U21A20130)
湖南创新型省份建设专项(2021GK4048)
湖南创新型省份建设专项(2023RC1068)
出版年
2024
NETL
NSTL
万方数据