Effect of AC Electric Field and Thickness of Electrolyte Film on Corrosion Behavior of A6082-T6 Al Alloy

doi:10.11902/1005.4537.2019.234

Journal of Chinese Society for Corrosion and protection

2020, Vol. 40

Issue (4): 342-350 DOI: 10.11902/1005.4537.2019.234

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Effect of AC Electric Field and Thickness of Electrolyte Film on Corrosion Behavior of A6082-T6 Al Alloy

HU Lulu¹, ZHAO Xuyang², LIU Pan¹, WU Fangfang², ZHANG Jianqing¹, LENG Wenhua¹(

), CAO Fahe¹^,³(

)

1. Department of Chemistry, Zhejiang University, Hangzhou 310027, China
2. Key Laboratory for Protection Technology of High-Rise Operation, Zhejiang Huadian Equipment Testing Institute Co. Ltd. , Hangzhou 310015, China
3. School of Materials, Sun Yat-sen University, Guangzhou 510006, China

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Abstract

The effect of alternating electric field on the corrosion behavior of A6082-T6 Al-alloy in an artificial atmospheric environment, namely, an electrolyte film on the surface of Al-alloy is studied by means of electrochemical impedance spectroscopy, open circuit potential and cathodic polarization curve measurements, as well as scanning electron microscopy. The results show that, with the decreasing of thickness of electrolyte film, the corrosion rate of A6082-T6 Al-alloy was accelerated. Meanwhile, the applied AC electric field could clearly alter the morphology of localized corrosion type of A6082-T6 Al-alloy, namely transformed from pitting corrosion with a large number of pits to serious exfoliation corrosion.

Key words: alternating electric field thickness of electrolyte layer aluminum alloy corrosion behavior EIS microscopic morphology

Received: 25 November 2019

ZTFLH:

TG172

Fund: National Natural Science Foundation of China(51771174);National Materials Corrosion and Protection Data Center

Corresponding Authors: LENG Wenhua,CAO Fahe E-mail: lengwh@zju.edu.cn;caofh5@mail.sysu.eud.cn

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	Lulu HU
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	Wenhua LENG
	Fahe CAO

Cite this article:

HU Lulu, ZHAO Xuyang, LIU Pan, WU Fangfang, ZHANG Jianqing, LENG Wenhua, CAO Fahe. Effect of AC Electric Field and Thickness of Electrolyte Film on Corrosion Behavior of A6082-T6 Al Alloy. Journal of Chinese Society for Corrosion and protection, 2020, 40(4): 342-350.

URL:

https://www.jcscp.org/EN/10.11902/1005.4537.2019.234 OR https://www.jcscp.org/EN/Y2020/V40/I4/342

Fig.1 Schematic diagrams of the experiment arrangement for corrosion test under thin electrolyte layer (TEL) and external alternating current field: (a) for the determination of TEL thickness, (b) the whole set-up for electrochemical measurement

Fig.2 Nyquist (a, c, e) and Bode (b, d, f) diagrams of A6082-T6 aluminum alloy immersed for 72 h in bulk solution (a, b) and under thin electrolyte layers with the thicknesses of 256 μm (c, d) and 70 μm (e, f)

Fig.3 Equivalent circuit diagrams for fitting plots of aluminum alloy A6082-T6 in 3.5%NaCl solution under the conditions of EIS without (a) and with (b) inductive arc

Fig.4 Evolutions of R_ct (a) and R_f+R_ct (b) of A6082-T6 aluminum alloy under 3.5%NaCl thin electrolyte layers with different thicknesses

Fig.5 Effects of AC electric field on the open circuit potential of A6082-T6 aluminum alloy after soaking for 20 min in 3.5%NaCl bulk solution (a) and under thin electrolyte layers with the thicknesses of 350 μm (b), 250 μm (c) and 150 μm (d)

Fig.6 Cathodic polarization curves and -1.0 V ultimate diffusion current of aluminum alloy in 3.5%NaCl bulk solution and under thin electrolyte layers with different thicknesses and AC electric fields of 0 kV/m (a, b), 20 kV/m (c, d), 60 kV/m (e, f) and 100 kV/m (g, h)

Fig.7 SEM images of A6082-T6 aluminum alloy after immersion for 72 h in 3.5%NaCl bulk solution (a) and under thin electrolyte layers with the thicknesses of 350 μm (b), 256 μm (c), 160 μm (d), 90 μm (e) and 70 μm (f) and EDS analysis of the hole (g) and flat surface zone (h) in Fig.7d

Fig.8 SEM images of A6082-T6 aluminum alloy after immersion for 12 h under external AC electric field of 20 kV/m in 3.5%NaCl bulk solution (a) and under thin electrolyte layers with the thicknesses of 350 μm (b), 250 μm (c) and 150 μm (d), and EDS data of the hole (e) and flat surface zone (f) in Fig.8c

Fig.9 SEM morphologies of A6082-T6 aluminum alloy after immersion for 12 h under external AC electric field of 60 kV/m in 3.5%NaCl bulk solution (a) and under thin electrolyte layers with the thicknesses 350 μm (b), 250 μm (c) and 150 μm (d), and enlarged view (e) and EDS result (f) of area I in Fig.9d

Fig.10 SEM morphologies of A6082-T6 aluminum alloy after immersion for 12 h under external AC electric field of 100 kV/m in 3.5%NaCl bulk solution (a) and under thin electrolyte layers with the different thicknesses of 350 μm (b), 250 μm (c) and 150 μm (d), and enlarged view of area I in Fig.10a (e) and EDS result of area II in Fig.10e (f)

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