Corrosion Inhibition Effect of Microorganism on 5754 Al Alloy in Seawater

doi:10.11900/0412.1961.2020.00129

Acta Metall Sin

2020, Vol. 56

Issue (12): 1681-1689 DOI: 10.11900/0412.1961.2020.00129

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Corrosion Inhibition Effect of Microorganism on 5754 Al Alloy in Seawater

SHEN Yuanyuan, DONG Yaohua(

), DONG Lihua, YIN Yansheng

College of Ocean Science and Engineering, Shanghai Maritime University, Shanghai 201306, China

Cite this article:

SHEN Yuanyuan, DONG Yaohua, DONG Lihua, YIN Yansheng. Corrosion Inhibition Effect of Microorganism on 5754 Al Alloy in Seawater. Acta Metall Sin, 2020, 56(12): 1681-1689.

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Abstract

Currently, with the gradual depletion of onshore resources, more efforts are being devoted to both scientific and resource exploitation of the ocean and the deep sea. Compared with the onshore environment, marine habitats are complex and characterized by high hydrostatic pressure, high salinity, and high marine population. The ocean is a unique aquatic environment, and it has a large population of microorganisms. There is a need to exploit the ocean for new energy sources. The significant challenges of exploiting oil, gas, and minerals have forced the people to innovate and develop advanced exploration tools. Al alloys are attractive for use in marine environments due to their low densities, high strengths, good plasticity, excellent electrical and thermal conductivities, and excellent corrosion resistance. The high chloride concentrations and microorganisms in the ocean have a significant effect on the corrosion resistance of many metallic materials. In this work, the corrosion behavior of 5754 Al alloy in seawater containing B.subtilis was investigated. The corrosion rate was analyzed by the weight loss method. The morphologies of the corrosion products and the corrosion profiles were observed by SEM and white light interferometer, respectively. The corrosion products were analyzed by energy dispersive spectroscopy and XRD. Finally, the corrosion mechanism of the Al alloy was studied using electrochemical impedance spectroscopy. The results show that the corrosion rate of the Al alloy in the seawater with B.subtilis was 12.5 mg/(dm²·d), which was only 1/6 times that in the seawater without the bacteria. A protective film comprising of CaMg(CO₃)₂ was gradually formed on the surface of the alloy in the presence of the bacteria. The bacteria promoted the formation of the CaMg(CO₃)₂ film, which protected the alloy from the seawater, and consequently, inhibited the pitting corrosion of the Al alloy in the marine environment.

Key words: 5754 Al alloy microorganism inhibition marine corrosion biomineralized film

Received: 22 April 2020

ZTFLH:

TG174.3

Fund: National Natural Science Foundation of China(51609133)

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	Yuanyuan SHEN
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https://www.ams.org.cn/EN/10.11900/0412.1961.2020.00129 OR https://www.ams.org.cn/EN/Y2020/V56/I12/1681

Fig.1 Surface morphologies and composition analyses of 5754 Al alloy

Fig.2 XRD spectra of 5754 Al alloy after soaking for 15 d in two solutions

Fig.3 2D (a, c, e) and 3D (b, d, f) surface profile images of 5754 Al alloy before (a, b), and after immersion for 15 d in sterile (c, d) and inoculated B.subtilis (e, f) seawater (Arrows show the locations of pitting)

Fig.4 EIS of the 5754 Al alloy in seawater without B.subtilis for different immersion time (Z'—real part of impedance, Z''—imaginary part of impedance, Z—impedance, f—frequency)

Fig.5 EIS of the 5754 Al alloy in seawater with B.subtilis for different immersion time

Fig.6 Equivalent circuit diagrams for 5754 Al alloy immersed in seawater with and without B.subtilis for 1 d (a), 5 d, 10 d and 15 d (b) (R_s—electrolyte resistance, R_f—resistance of products film or mixture film, Q_f—constant phase element (CPE) of product film or mixture film, R_ct—charge transfer resistance, Q_dl—CPE of electron transfer reaction)

Table 1 Electrochemical fitting parameters of 5754 Al alloy immersed in seawater without bacteria for different time

Table 2 Electrochemical fitting parameters of 5754 Al alloy immersed in seawater with bacteria for different time

Fig.7 The sum of R_f and R_ct variation of 5754 Al alloy immersed in seawater with and without B.subtilis for different time

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