Influence of Pseudomonas Aeruginosa on Corrosion Behavior of Additively Manufactured Al-Mg-Sc-Zr Alloy in Marine Environment

doi:10.11902/1005.4537.2025.189

Journal of Chinese Society for Corrosion and protection

2026, Vol. 46

Issue (1): 60-70 DOI: 10.11902/1005.4537.2025.189

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Influence of Pseudomonas Aeruginosa on Corrosion Behavior of Additively Manufactured Al-Mg-Sc-Zr Alloy in Marine Environment

ZHANG Junnan¹, PENG Can²(

), FU Qi¹(

), ZHANG Liang², SONG Guangling¹(

)

^1.Department of Ocean Science and Engineering, Southern University of Science and Technology, Shenzhen 518055, China
^2.Institute of Intelligent Manufacturing Technology, Shenzhen Polytechnic University, Shenzhen 518055, China

Cite this article:

ZHANG Junnan, PENG Can, FU Qi, ZHANG Liang, SONG Guangling. Influence of Pseudomonas Aeruginosa on Corrosion Behavior of Additively Manufactured Al-Mg-Sc-Zr Alloy in Marine Environment. Journal of Chinese Society for Corrosion and protection, 2026, 46(1): 60-70.

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Abstract

A bulk Al-Mg-Sc-Zr alloy was fabricated by using selective laser melting (SLM) technique. Then its corrosion behavior of the alloy was investigated by immersion in Pseudomonas aeruginosa (P. aeruginosa) inoculated artificial seawater for 14 d, meanwhile the distribution of P. aeruginosa on the alloy surface was observed via fluorescence microscopy, and the trend in cell population changes was statistically analyzed. The corrosion behavior and mechanism of the alloy in both sterile and inoculated environments were investigated through electrochemical tests, scanning electron microscopy (SEM), white light interferometry, and X-ray photoelectron spectroscopy (XPS). The results demonstrated that the Al-Mg-Sc-Zr alloy exhibited excellent corrosion resistance in the sterile group, with virtually no observable pitting on the surface. In contrast, in the inoculated group, P. aeruginosa could adhere to the alloy surface and induced severe localized corrosion. P. aeruginosa could extract electrons from Al and Mg elements to sustain its metabolic activities, while oxygen concentration cells were formed inside the heterogeneous biofilm, significantly exacerbating the development of localized corrosion and reducing the corrosion stability of the alloy.

Key words: additive manufacturing Al-alloy Pseudomonas aeruginosa microbiologically influenced corrosion

Received: 17 June 2025 32134.14.1005.4537.2025.189

ZTFLH:

TG174

Fund: National Natural Science Foundation of China(52250710159);China Postdoctoral Science Foundation(2024M751292)

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	ZHANG Junnan
	PENG Can
	FU Qi
	ZHANG Liang
	SONG Guangling

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https://www.jcscp.org/EN/10.11902/1005.4537.2025.189 OR https://www.jcscp.org/EN/Y2026/V46/I1/60

Fig.1 Schematic diagram of forming process for the Al-Mg-Sc-Zr alloy

Fig.2 Metallographic images (a, b) and SEM secondary electron images (c, d) of the Al-Mg-Sc-Zr alloy

Fig.3 Changes in pH value and cell counts of the test solution (a) and fluorescence images of P. aeruginosa cells on the Al-Mg-Sc-Zr alloy surfaces (b)

Fig.4 OCP values (a) and Nyquist diagrams of the Al-Mg-Sc-Zr alloy in the sterile (b) and inoculated media (c), and the R_ct + R_f values of the Al-Mg-Sc-Zr alloy from curve-fitting of the EIS spectra (d), and equivalent circuit models used for curve-fitting of the EIS spectra displayed in Fig.4b and Fig.4c during the 14 d experiment

Table 1 Electrochemical parameters derived from the EIS spectra for the Al-Mg-Sc-Zr alloy in the abiotic and biotic media

Fig.5 Potentiodynamic polarization curves of Al-Mg-Sc-Zr alloy after 14 d of immersion in the sterile and inoculated media

Table 2 Relative electrochemical parameters of Al-Mg-Sc-Zr alloy calculated from potentiodynamic polarization curves after 14 d of testing

Fig.6 Morphologies of surface films: (a, b) SEM images and (b1, b2) EDS mapping results from (b) after 14 d of immersion in the sterile media; (c, d) SEM images and (d1-d6) EDS mapping results from (d) after 14 d of immersion in the inoculated media

Fig.7 2D and 3D color images of the Al-Mg-Sc-Zr alloy surfaces after removal of corrosion products in the sterile medium (a) and in the inoculated medium (b)

Fig.8 High-resolution XPS spectra Al 2p (a1), Mg 1s (a2), N 1s (a3) and P 2p (a4) for Al-Mg-Sc-Zr alloy in the sterile medium; Al 2p (b1), Mg 1s (b2), N 1s (b3) and P 2p (b4) for Al-Mg-Sc-Zr alloy in the inoculated medium

Fig.9 Schematic diagram of P. aeruginosa induced corrosion of Al-Mg-Sc-Zr alloy

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