高速列车铆接件中6A01铝合金腐蚀行为研究

doi:10.11902/1005.4537.2021.120

中国腐蚀与防护学报

2022, Vol. 42

Issue (3): 507-512 DOI: 10.11902/1005.4537.2021.120

研究报告

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高速列车铆接件中6A01铝合金腐蚀行为研究

陈志坚¹, 周学杰¹^,²(

), 陈昊¹^,³

^1.武汉材料保护研究所有限公司武汉 430030
^2.湖北武汉大气淡水环境材料腐蚀国家野外观测科学研究站武汉 430030
^3.新疆尉犁大气环境材料腐蚀国家野外科学观测研究站尉犁 841500

Corrosion Behavior of Riveted Pair of 6A01 Al-alloy-/304 Stainless Steel-plate Used for High-speed Train

CHEN Zhijian¹, ZHOU Xuejie¹^,²(

), CHEN Hao¹^,³

^1.Wuhan Research Institute of Materials Protection, Wuhan 430030, China
^2.Wuhan Materials Corrosion National Observation and Research Station, Wuhan 430030, China
^3.Yuli Materials Corrosion National Observation and Research Station, Yuli 841500, China

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摘要:

利用失重法、扫描电子显微镜 (SEM)、能谱仪 (EDS)、X射线衍射仪 (XRD)、3D超景深显微镜等方法分析了试样的腐蚀动力学、锈层成分、腐蚀形貌。结果表明：偶接后铝合金发生了电偶腐蚀，电偶腐蚀速率是自腐蚀速率的8~10倍。铝合金主要腐蚀产物为Al₂O₃、Al(OH)₃、AlO(OH)、AlCl₃，腐蚀产物的变化影响了铝合金的腐蚀过程，产物的龟裂加速了腐蚀，而产物的致密化起到了保护作用。

关键词 ：铆接件, 6A01铝合金, 304不锈钢, 电偶腐蚀

Abstract：

The corrosion process of the riveted pair of 6A01 Al-alloy-/304 stainless steel-plate was assessed via cyclic salt spray test, aiming especially to clarify the corrosion behavior of the 6A01 Al-alloy, as the main component of the riveted pear. The corrosion kinetics, rust composition and corrosion morphology of the alloy samples were characterized by means of weightlessness method, scanning electron microscope (SEM), energy dispersive spectroscope (EDS), 3D super depth of field microscope and other methods. The results showed that galvanic corrosion and crevice corrosion occurred for the Al-alloy after being riveted onto 304 stainless steel, and its corrosion rate was 8-10 times higher than that of the blank alloy. The variation of corrosion products on the surface of Al-alloy may in turn affect the corrosion process of the Al-alloy. The cracking of the corrosion product can accelerate the corrosion process, whereas, the densification of the corrosion product may be beneficial to its protectiveness.

Key words： riveting parts 6A01 Al- alloy 304 stainless steel galvanic corrosion

收稿日期: 2021-05-28

ZTFLH:

TG174

通讯作者: 周学杰 E-mail: zhouxj11@163.com

Corresponding author: ZHOU Xuejie E-mail: zhouxj11@163.com

作者简介: 陈志坚，男，1997年生，硕士生

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引用本文:

陈志坚, 周学杰, 陈昊. 高速列车铆接件中6A01铝合金腐蚀行为研究[J]. 中国腐蚀与防护学报, 2022, 42(3): 507-512.
Zhijian CHEN, Xuejie ZHOU, Hao CHEN. Corrosion Behavior of Riveted Pair of 6A01 Al-alloy-/304 Stainless Steel-plate Used for High-speed Train. Journal of Chinese Society for Corrosion and protection, 2022, 42(3): 507-512.

链接本文:

https://www.jcscp.org/CN/10.11902/1005.4537.2021.120 或 https://www.jcscp.org/CN/Y2022/V42/I3/507

图1 不同盐雾腐蚀时间后的6A01铝合金的腐蚀速率

图2 不同盐雾时间后6组试样中6A01铝合金表面形貌

图3 不同盐雾腐蚀时间后6A01铝合金搭接处表面点蚀坑形貌

图4 6组试样表面SEM像及对应区域EDS结果

图5 6A01铝合金经不同循环盐雾时间后腐蚀产物的XRD谱

图6 304不锈钢及6A01铝合金基材和循环盐雾实验后6组铝合金开路电位

图7 空白试样及循环盐雾实验后6组铝合金极化曲线

表1 极化曲线拟合数据

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