冷拉拔变形过程中含稀土铝镁合金腐蚀行为研究

doi:10.11902/1005.4537.2019.201

中国腐蚀与防护学报

2020, Vol. 40

Issue (5): 432-438 DOI: 10.11902/1005.4537.2019.201

海洋材料腐蚀与防护专辑

本期目录 | 过刊浏览

冷拉拔变形过程中含稀土铝镁合金腐蚀行为研究

张欣¹^,²(

), 杨光恒¹, 王泽华¹, 曹静¹, 邵佳¹, 周泽华¹

1 河海大学力学与材料学院南京 211100
2 河海大学海洋与近海工程研究院南通 226300

Corrosion Behavior of Al-Mg-RE Alloy Wires Subjected to Different Cold Drawing Deformation

ZHANG Xin¹^,²(

), YANG Guangheng¹, WANG Zehua¹, CAO Jing¹, SHAO Jia¹, ZHOU Zehua¹

1 College of Mechanics and Materials, Hohai University, Nanjing 211100, China
2 Ocean and Offshore Engineering Research Institute, Hohai University, Nantong 226300, China

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摘要:

采用光学显微镜 (OM)、扫描电子显微镜 (SEM)、能谱分析仪 (EDS)、电化学工作站研究了在不同冷拉拔变形量下，Al-3.0%Mg-0.12%RE (质量分数) 合金微观组织和腐蚀行为的变化规律，探索了冷拉拔变形量和微观组织对合金耐蚀性的影响。结果表明：随着冷拉拔变形量增加，Al-3.0%Mg-0.12%RE合金中等轴状晶粒向纤维状晶粒转变，晶粒均沿拉拔方向拉长，垂直拉拔方向拉扁，晶界处第二相被拉长并随着晶界的变形逐渐向线状分布。合金点蚀均主要发生在合金中的第二相处，随着冷拉拔变形量的增加，Al-3.0%Mg-0.12%RE合金均匀腐蚀敏感性增强，但点蚀敏感性减弱，阻抗半径增大，耐蚀性变好。

关键词 ： Al-3.0%Mg-0.12%RE合金, 冷拉拔变形, 腐蚀行为, 点蚀

Abstract：

Al-Mg alloys are considered as the ideal electromagnetic shielding materials and widely applied on electronic and communication servicing in marine environment due to their excellent comprehensive properties, such as high specific strength, low electric resistivity and excellent corrosion resistance. The microstructure and corrosion behavior of Al-3.0%Mg-0.12%RE alloy wires subjected to different cold drawing deformation was investigated by means of optical microscope (OM), scanning electron microscope (SEM), energy disperse spectroscopy (EDS) and electrochemical measurement. The influence of cold-drawing strain and microstructure on corrosion resistance of the alloy was also examined. The results indicated that the equiaxed grains of the alloys were elongated and the skeletal second phase particles were fragmented during the cold-drawing process. The corrosion behavior of the Al-3.0%Mg-0.12%RE alloy showed typical characteristics of pitting corrosion at the position of second phases. With the increase of strain, the uniform corrosion sensibility increased, pitting corrosion sensibility declined and the corrosion resistance of the alloy improved.

Key words： Al-3.0%Mg-0.12%RE alloy cold drawing process corrosion behavior pitting corrosion

收稿日期: 2019-11-13

ZTFLH:

TG174

基金资助:南通市科技计划项目(JC2018047);中央高校基本科研业务费项目(2018B02514)

通讯作者: 张欣 E-mail: zhangxin.007@163.com

Corresponding author: ZHANG Xin E-mail: zhangxin.007@163.com

作者简介: 张欣

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引用本文:

张欣, 杨光恒, 王泽华, 曹静, 邵佳, 周泽华. 冷拉拔变形过程中含稀土铝镁合金腐蚀行为研究[J]. 中国腐蚀与防护学报, 2020, 40(5): 432-438.
Xin ZHANG, Guangheng YANG, Zehua WANG, Jing CAO, Jia SHAO, Zehua ZHOU. Corrosion Behavior of Al-Mg-RE Alloy Wires Subjected to Different Cold Drawing Deformation. Journal of Chinese Society for Corrosion and protection, 2020, 40(5): 432-438.

链接本文:

https://www.jcscp.org/CN/10.11902/1005.4537.2019.201 或 https://www.jcscp.org/CN/Y2020/V40/I5/432

图1 铝合金浇注试样

图2 拉拔装置示意图

图3 组织分析和耐蚀性测试取样示意图

图4 铸态Al-3.0%Mg-0.12%RE合金微观组织形貌与EDS元素分析

图5 不同变形量下Al-3.0%Mg-0.12%RE合金微观组织形貌

图6 不同变形量Al-3.0%Mg-0.12%RE合金的第二相形貌

图7 铸态Al-3.0%Mg-0.12%RE合金在3.5%NaCl溶液中浸泡21 d后合金表面形貌和EDS分析

图8 不同变形量Al-3.0%Mg-0.12%RE合金在浸泡21 d后表面形貌

图9 不同变形量Al-3.0%Mg-0.12%RE合金在3.5%NaCl溶液中极化曲线

表1 不同变形量Al-3.0%Mg-0.12%RE合金的Ecorr和Epit值

图10 不同变形量Al-3.0%Mg-0.12%RE合金Nyquist图

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