晶粒尺寸对7075铝合金腐蚀行为的影响研究

张建文; 黄举林; 黄玉辉; 邹向丹; 赵昊; 邵国华

doi:10.7643/ issn.1672-9242.2025.10.015

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装备环境工程 ›› 2025, Vol. 22 ›› Issue (10) : 123-131. DOI: 10.7643/ issn.1672-9242.2025.10.015

重大工程装备

晶粒尺寸对7075铝合金腐蚀行为的影响研究

张建文¹, 黄举林¹, 黄玉辉¹, 邹向丹², 赵昊², 邵国华^{3, *}

作者信息 +

Effect of Grain Size on Corrosion Behavior of 7075 Aluminum Alloy

ZHANG Jianwen¹, HUANG Julin¹, HUANG Yuhui¹, ZOU Xiangdan², ZHAO Hao², SHAO Guohua^{3, *}

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文章历史 +

摘要

目的系统研究晶粒尺寸对其腐蚀行为的影响机制。方法采用放电等离子烧结技术制备3种不同晶粒尺寸的7075铝合金材料,通过动电位极化曲线、电化学阻抗谱以及微区电化学扫描技术,结合第一性原理计算,分析晶粒尺寸与合金腐蚀敏感性存在相关性。结果晶粒尺寸最小的S3试样表现出最低的腐蚀电位（-0.79 V）、最大的腐蚀电流密度（1.1×10^-5 A/cm²）以及最大的晶间腐蚀深度,耐蚀性最差。晶界处富集的含铜析出相作为阴极活性位点,增大了阴极反应面积,通过加速阴极反应中的氧还原反应诱发阳极溶解。此外,相同平均尺寸下,晶粒分布均匀的S2试样较分散的S1试样耐蚀性更优。结论晶粒尺寸均匀性是影响合金耐蚀性能的关键因素,为高强铝合金的晶粒优化设计提供了依据。

Abstract

The work aims to systematically study the influence mechanism of grain size on its corrosion behavior. Three different grain sizes of 7075 aluminum alloy samples were prepared using discharge plasma sintering technology, Through potentiodynamic polarization curves, electrochemical impedance spectroscopy, and micro area electrochemical scanning techniques, combined with first-principles calculations, the correlation between grain size and alloy corrosion sensitivity was analyzed. The S3 sample with the smallest grain size exhibited the lowest corrosion potential (-0.79 V), the maximum corrosion current density (1.1×10^-5 A/cm²), and the maximum intergranular corrosion depth, with the worst corrosion resistance. The copper containing precipitates enriched at grain boundaries served as cathode active sites, inducing anodic dissolution by accelerating oxygen reduction reactions. In addition, under the same average size, S2 samples with uniform grain distribution had better corrosion resistance than dispersed S1 samples. In conclusion, grain size uniformity is a key factor affecting the corrosion resistance of alloys, providing a basis for optimizing the grain design of high-strength aluminum alloys.

导出引用

张建文, 黄举林, 黄玉辉, 邹向丹, 赵昊, 邵国华. 晶粒尺寸对7075铝合金腐蚀行为的影响研究[J]. 装备环境工程. 2025, 22(10): 123-131 https://doi.org/10.7643/ issn.1672-9242.2025.10.015

ZHANG Jianwen, HUANG Julin, HUANG Yuhui, ZOU Xiangdan, ZHAO Hao, SHAO Guohua. Effect of Grain Size on Corrosion Behavior of 7075 Aluminum Alloy[J]. Equipment Environmental Engineering. 2025, 22(10): 123-131 https://doi.org/10.7643/ issn.1672-9242.2025.10.015

中图分类号： TG172

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