Corrosion Characteristics of 5A06 Al-alloy Exposed in Natural Deep-sea Environment

doi:10.11902/1005.4537.2022.102

Journal of Chinese Society for Corrosion and protection

2023, Vol. 43

Issue (2): 352-358 DOI: 10.11902/1005.4537.2022.102

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Corrosion Characteristics of 5A06 Al-alloy Exposed in Natural Deep-sea Environment

DUAN Tigang, LI Zhen, PENG Wenshan, ZHANG Penghui, DING Kangkang, GUO Weimin, HOU Jian, MA Li, XU Likun(

)

State Key Laboratory for Marine Corrosion and Protection, Luoyang Ship Material Research Institute (LSMRI), Qingdao 266237, China

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Abstract

The deep-sea corrosion behavior of 5A06 Al-alloy was investigated through field exposure corrosion testing in the Western Pacific Ocean via a home-made cascade-type testing facility. After being exposed for 1 a in the marine environment at the depth of 500, 800, 1200 and 2000 m, respectively, the tested samples of 5A06 Al-alloy were examined by means of electrochemical test methods, scanning electron microscope with energy dispersive spectrometer and X-ray photoelectron spectroscope, in terms of electrochemical performance, corrosion morphology and corrosion characteristics etc. Results show that the average corrosion rate of 5A06 Al-alloy increases and then decreases with the increasing depth. The maximum average corrosion rate is 17 μm/a at the depth of 500 m, which is 3.1 times superior to that in the shallow. At the depth ranges from 800 m to 2000 m, the corrosion rate varies within 0.9-1.4 μm/a. Electrochemical test results show that the self-corrosion potential shifts positively with the increasing depth, while the charge transfer resistance increases.

Key words: Western Pacific Ocean deep-sea corrosion 5A06 Al-alloy surface characteristics

Received: 11 April 2022 32134.14.1005.4537.2022.102

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About author: XU Likun, E-mail: xulk@sunrui.net

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	Tigang DUAN
	Zhen LI
	Wenshan PENG
	Penghui ZHANG
	Kangkang DING
	Weimin GUO
	Jian HOU
	Li MA
	Likun XU

Cite this article:

DUAN Tigang, LI Zhen, PENG Wenshan, ZHANG Penghui, DING Kangkang, GUO Weimin, HOU Jian, MA Li, XU Likun. Corrosion Characteristics of 5A06 Al-alloy Exposed in Natural Deep-sea Environment. Journal of Chinese Society for Corrosion and protection, 2023, 43(2): 352-358.

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https://www.jcscp.org/EN/10.11902/1005.4537.2022.102 OR https://www.jcscp.org/EN/Y2023/V43/I2/352

Fig.1 Corrosion photographs of 5A06 Al-alloy exposed at the depth of 500 m (a), 800 m (b), 1200 m (c) and 2000 m (d) before rust removal and after rust removal (e-h) for 1 a

Fig.2 SEM images of aluminum alloy 5A06 Al-alloy exposed to the deep sea environment at the depth of 500 m (a), 800 m (b), 1200 m (c) and 2000 m (d) for 1 a

Fig.3 EDS results of 5A06 Al-alloy corrosion products at the depth of 500 m (a), 800 m (b), 1200 m (c) and 2000 m (d) for 1 a

Table 1 Tafel analysis results of 5A06 Al-alloy after exposing at various sea depths for 1 a

Table 2 Fitting results for EIS spectra of 5A06 Al-alloy

Fig.4 XPS analysis of the surface film of the corrosion product film of 5A06 Al-alloy at different depths: (a) survey, (b) Al 2p, (c) Mg 1s

Fig.5 Comparison of average corrosion rates for 5A06 Al-alloy after 1 a exposure (a) and comparison of pitting average and maximum depths for different sea depths (b)

Fig.6 Tafel plots of 5A06 Al-alloy after exposing at different sea depths for 1 a

Fig.7 Nyquist plots and equivalent circuit (a) and Bode plots (b) of 5A06 Al-alloy after exposure at different deep-sea depths for 1 a

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