Effect of Na on Early Atmospheric Corrosion of Al

doi:10.11900/0412.1961.2018.00280

Acta Metall Sin

2019, Vol. 55

Issue (4): 529-536 DOI: 10.11900/0412.1961.2018.00280

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Effect of Na on Early Atmospheric Corrosion of Al

Xingchen CHEN,Jie WANG,Deren CHEN,Shuncong ZHONG,Xiangfeng WANG(

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State Key Laboratory of Photocatalysis on Energy and Environment, School of Mechanical Engineering and Automation, Fuzhou University, Fuzhou 350002, China

Cite this article:

Xingchen CHEN, Jie WANG, Deren CHEN, Shuncong ZHONG, Xiangfeng WANG. Effect of Na on Early Atmospheric Corrosion of Al. Acta Metall Sin, 2019, 55(4): 529-536.

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Abstract

Aluminum and aluminum alloy are widely used in every field of modern life. It is especially important to understand the detailed mechanisms of aluminum atmospheric corrosion. Traditional studies only consider the role of oxygen reduction and focus on anions such as Cl^－, SO₄^2－ in the environment, ignoring the effects of cations such as Na⁺ on the atmospheric corrosion. However, recent studies have shown that the effect of Na element on the corrosion of aluminum can not be ignored. In this work, single-shot laser-induced breakdown spectroscopy (LIBS) was used to measure the aluminum atomic lines after corrosion for 35 d in the atmospheric environment, and combined with a three-dimensional tomography measurement, to study the depth profiling of Na on the aluminum surface. The results show that the Na element on the surface of the aluminum originates from the atmospheric environment, and Na is involved in the formation of corrosion product NaAlCO₃(OH)₂. The content of NaAlCO₃(OH)₂ decreases as the depth increases following an exponential power function. The content decrease of NaAlCO₃(OH)₂ in different depths can be transformed into the change of cathode area. Combined with the measured polarization curve of aluminum, the atmospheric corrosion model of aluminum including the presence of oxygen reduction and the change of cathode area was established using COMSOL software. The calculated corrosion depth is 6.155 μm, which is consistent with the depth of Na element measured by LIBS experiments. By studying the distribution of Na cations and corrosion products, a simulation model was established to reveal the influence on corrosion mechanism, which is of great significance for the study of early atmospheric corrosion of aluminum.

Key words: atmospheric corrosion laser induced breakdown spectroscopy (LIBS) three-dimensional topography corrosion product COMSOL

Received: 27 June 2018

ZTFLH:

TG146

Fund: National Natural Science Foundation of China(No.51675103);State Key Laboratory of Photocatalysis on Energy and Environment(No.SKLPEE-KF201719);Fuzhou Science and Technology Bureau(No.2018-G-35)

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	Xingchen CHEN
	Jie WANG
	Deren CHEN
	Shuncong ZHONG
	Xiangfeng WANG

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https://www.ams.org.cn/EN/10.11900/0412.1961.2018.00280 OR https://www.ams.org.cn/EN/Y2019/V55/I4/529

Fig.1 Microscopic images of Al surface before (a) and after 5 weeks (b) in atmosphere

Fig.2

Fig.3 Three-dimensional topography of an ablation crater (a) and the heights of the crater (b)

Fig.4 Polarization curves (a) and Tafel polarization curves (b) of Al in 3%NaCl solution at pH=7 and 25 ℃ (i—current density)

Fig.5 A schematic diagram showing the atmospheric corrosion process of Al

Fig.6 Relative content of Na in different depths of Al after atmospheric corrosion (a) and the relative area of cathode vs the corrosion depth (b)

Fig.7 Atmospheric corrosion model of Al using COMSOL software (E—potential in the electrolyte, M—molar mass of metal, F—Faraday constant, I—current in the electrolyte, I_an—corrosion current of anodic corrosion, z—number of electrons, v—corrosion rate, ρ—density of the metal matrix, σ—conductivity)

Table 1 Electrochemical corrosion parameters of Al

Fig.8

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