Initial corrosion behavior and mechanism of 7B04 aluminum alloy under acid immersion and salt spray environments

腐蚀 材料科学 扫描电子显微镜 点蚀 介电谱 开尔文探针力显微镜 合金 沉浸式(数学) 冶金 极化(电化学) 傅里叶变换红外光谱 电化学 化学工程 复合材料 化学 电极 原子力显微镜 纳米技术 物理化学 纯数学 工程类 数学
作者
Yangguang Zhang,Yueliang Chen,Yong Zhang,Guixue Bian,Chenguang Wang,Andong Wang
出处
期刊:Chinese Journal of Aeronautics [Elsevier BV]
卷期号:35 (1): 277-289 被引量:11
标识
DOI:10.1016/j.cja.2021.05.005
摘要

The initial corrosion behavior and mechanism of 7B04 aluminum alloy under acid immersion and salt spray environments (pH = 3.5) are studied by Scanning Electron Microscope (SEM), optical microscope, Fourier Transform Infrared Spectroscopy (FT-IR), X-Ray Diffraction (XRD), potentiodynamic polarization, Electrochemical Impedance Spectroscopy (EIS), and Scanning Kelvin Probe (SKP). The results show that pitting corrosion occurs at the initial corrosion stage, and the potential difference between the second phase particles is the main cause of pitting. Pitting pits on different locations gradually expand and coalesce with the proceeding of corrosion. The main components of corrosion products are Al2O3, Al(OH)3, and AlCl3, and the generation rate of the corrosion product layer under the salt spray environment is larger than that under acid immersion environment. Under both environments, the Volta potential distribution first disperses and then concentrates, while the charge transfer resistance first decreases and then increases with the corrosion time. The Volta potential gradually shifts in a positive direction, indicating that corrosion products have an inhibitory effect on corrosion. After the same corrosion time, the corrosion product layer resistance and the expectation of the Volta potential of the salt spray sample are higher than those of the immersion sample. Comparatively, the corrosion current density for the salt spray sample is significantly lower than the immersion sample, which indicates that the thicker the corrosion product layer, the stronger the inhibition of corrosion reaction.
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