超细层片结构Al-4%Cu合金的点蚀行为

doi:10.11902/1005.4537.2021.041

中国腐蚀与防护学报

2022, Vol. 42

Issue (2): 274-280 DOI: 10.11902/1005.4537.2021.041

研究报告

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超细层片结构Al-4%Cu合金的点蚀行为

辛叶春, 徐伟, 赵东杨, 张波(

)

中国科学院金属研究所沈阳材料科学国家研究中心沈阳 110016

Pitting Corrosion Behavior of Ultra-fine Lamellated Al-4%Cu Alloy

XIN Yechun, XU Wei, ZHAO Dongyang, ZHANG Bo(

)

Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China

全文: PDF(3725 KB) HTML

摘要:

采用室温冷轧方法制备了具有超细层片结构的Al-4%Cu (质量分数) 合金，并利用SEM、TEM、显微硬度测试及动电位极化方法对比研究了晶界处元素偏聚及时效析出相对其点蚀行为的影响。结果表明，冷轧后Al-Cu合金平均层片间距159 nm，晶界处存在Cu的偏聚，其点蚀电位与粗晶样品相当。时效后，超细晶Al-Cu点蚀电位因晶界θ相的析出而降低。可见，Cu偏聚对Al-Cu合金的点蚀行为并无明显影响，但形成富Cu相后对点蚀行为影响显著。

关键词 ：超细层片, 元素偏聚, 析出相, 点蚀

Abstract：

The pitting corrosion behavior of ultra-fine lamellated (UFL) Al-4%Cu alloy prepared by cold rolling at room temperature has been studied by means of scanning electron microscope (SEM), transmission electron microscope (TEM), microhardness tester and potentiodynamic polarization measurement aiming to understand the effect of element segregation and precipitates at grain boundaries on pitting corrosion potential. The result shows that the average lamellar spacing of cold rolled Al-Cu alloy is 159 nm and there exists obvious segregation of Cu at boundaries. The pitting corrosion potential of the cold rolled Al-Cu is found to be similar to that of the coarse grain ones. After aging treatment, the pitting corrosion potential decreases obviously because of precipitation of second phases at grain boundaries. These results indicate that the element segregation at grain boundaries has no significant effect on the pitting corrosion behavior of Al-Cu alloy, while the precipitation of second phases rich in Cu can have an obvious effect on the pitting corrosion behavior.

Key words： Ultra-fine lamellar element segregation precipitates pitting corrosion

收稿日期: 2021-03-05

ZTFLH:

TG174

基金资助:国家重点研发计划(2017YFB0702103)

通讯作者: 张波 E-mail: bxz011@imr.ac.cn

Corresponding author: ZHANG Bo E-mail: bxz011@imr.ac.cn

作者简介: 辛叶春，男，1996年，博士生

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引用本文:

辛叶春, 徐伟, 赵东杨, 张波. 超细层片结构Al-4%Cu合金的点蚀行为[J]. 中国腐蚀与防护学报, 2022, 42(2): 274-280.
Yechun XIN, Wei XU, Dongyang ZHAO, Bo ZHANG. Pitting Corrosion Behavior of Ultra-fine Lamellated Al-4%Cu Alloy. Journal of Chinese Society for Corrosion and protection, 2022, 42(2): 274-280.

链接本文:

https://www.jcscp.org/CN/10.11902/1005.4537.2021.041 或 https://www.jcscp.org/CN/Y2022/V42/I2/274

图1 冷轧后超细层片结构Al-4%Cu合金的结构表征

图2 显微硬度随退火温度的变化

图3 超细层片Al-4Cu合金150 ℃退火后结构表征

图4 80 ℃时效过程显微硬度变化及不同时效时间后的组织

图5 不同处理状态样品的极化曲线及72 h浸泡实验后的腐蚀形貌

图6 敏化后的超细晶样品经72 h浸泡实验后的点蚀形貌及元素分布图

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