载荷对<strong>5383</strong>铝合金焊接接头电化学腐蚀行为的影响

doi:10.11902/1005.4537.2024.213

中国腐蚀与防护学报

2025, Vol. 45

Issue (2): 515-522 CSTR: 32134.14.1005.4537.2024.213 DOI: 10.11902/1005.4537.2024.213

研究报告

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载荷对5383铝合金焊接接头电化学腐蚀行为的影响

翟熙伟¹^,²(

), 刘士一², 王丽¹, 贾瑞灵¹^,², 张慧霞³

^1.中山职业技术学院机电工程学院中山 528400
^2.内蒙古工业大学材料科学与工程学院呼和浩特 010051
^3.中国船舶集团有限公司第七二五研究所海洋腐蚀与防护全国重点实验室青岛 266237

Effect of Applied Load on Corrosion Behavior of 5383 Al-alloy Welded Joints

ZHAI Xiwei¹^,²(

), LIU Shiyi², WANG Li¹, JIA Ruiling¹^,², ZHANG Huixia³

^1.School of Mechatronics Engineering, Zhongshan Polytechnic, Zhongshan 528400, China
^2.School of Materials Science and Engineering, Inner Mongolia University of Technology, Hohhot 010051, China
^3.National Key Laboratory of Marine Corrosion and Protection, Luoyang Ship Material Research Institute, Qingdao 266237, China

引用本文:

翟熙伟, 刘士一, 王丽, 贾瑞灵, 张慧霞. 载荷对5383铝合金焊接接头电化学腐蚀行为的影响[J]. 中国腐蚀与防护学报, 2025, 45(2): 515-522.
Xiwei ZHAI, Shiyi LIU, Li WANG, Ruiling JIA, Huixia ZHANG. Effect of Applied Load on Corrosion Behavior of 5383 Al-alloy Welded Joints[J]. Journal of Chinese Society for Corrosion and protection, 2025, 45(2): 515-522.

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摘要:

本文开展了5383铝合金及其焊接接头分别施加不同载荷(50%R_el、80%R_el、100%R_el，R_el为其屈服强度)在天然海水环境中的电化学腐蚀行为研究，采用四点弯曲加载装置进行恒载荷应力腐蚀实验，同时进行电化学测试。结果表明，5383铝合金母材有明显的钝化现象，而焊接接头几乎不存在钝化区间。载荷低于屈服强度时，焊接接头的电荷转移电阻(R_ct)比未加载荷降低一个数量级，载荷等于屈服强度时，R_ct降低两个数量级。这是因为当载荷增加至屈服强度时，不仅内部的微观结构和应力状态会发生变化，表面钝化膜也难于形成，失去钝化膜对焊接接头的保护作用，腐蚀逐渐向基体内部发展，导致5383铝合金焊接接头的腐蚀速率增加。

关键词 ：腐蚀行为, 铝合金, 焊接接头, 钝化膜

Abstract：

Corrosion behavior of 5383 Al-alloy and its welded joints was investigated in a nature seawater by applied different loads (50%R_el, 80%R_el, 100%R_el). Its stress corrosion behavior was assessed via a four-point bending device by applied constant load and electrochemical measurement. The results showed that the bare 5383 Al-alloy exhibited obvious passivation phenomenon, while no passivation for the welded joints. When the applied load was lower than the yield strength, the charge transfer resistance (R_ct) of the welded joints decreased by an order of magnitude compared to that without applied load. When the applied load was equal to the yield strength, R_ct decreased by two orders of magnitude. This is because when the load is increased up to the level of yield strength, not only the microstructure and stress state of the alloy are changed, but the surface passivation film is also difficult to form. Therefore, due to losing the protective effect of the passivation film, the corrosion may gradually propagate inward to the interior, resulting in an increase in the corrosion rate of welded joints of 5383 Al-alloy.

Key words： corrosion behavior Al-alloy welded joint passivation film

收稿日期: 2024-07-17 32134.14.1005.4537.2024.213

ZTFLH:

TG172

基金资助:广东省普通高校重点领域专项(2024ZDZX3070);中山职业技术学院高层次人才科研启动项目(KYG2201)

通讯作者: 翟熙伟，E-mail：xiweizhai@163.com，研究方向为铝合金焊接及接头性能

Corresponding author: ZHAI Xiwei, E-mail: xiweizhai@163.com

作者简介: 翟熙伟，男，1970年生，博士，副教授

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https://www.jcscp.org/CN/10.11902/1005.4537.2024.213 或 https://www.jcscp.org/CN/Y2025/V45/I2/515

表1 5383铝合金及5183焊丝的化学成分 (mass fraction / %)

图1 四点弯曲加载装置示意图

图2 5383铝合金焊接接头在不同应力下的电化学阻抗谱

图3 5383铝合金焊接接头在不同载荷下电化学阻抗的等效电路图

表2 不同载荷下5383铝合金焊接接头电化学阻抗拟合结果

图4 5383铝合金母材与焊接接头在不同外加载荷下的极化曲线

表3 不同载荷作用下5383铝合金母材及焊接接头极化曲线的拟合结果

图5 施加载荷为50%Rel时5383铝合金的分段极化曲线

图6 1号试样极化测试后的微观形貌及能谱分析

图7 2号试样极化测试后的表面形貌

图8 3号试样极化测试后的表面形貌和能谱线扫描分析

图9 4号试样极化测试后的表面形貌和EDS线扫描分析

图10 不同载荷下5383铝合金表面的Mott-schottky曲线

图11 5383铝合金在不同载荷下形成钝化膜的Efb与Na

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