Study on corrosion mechanism of Al–Zn coatings in the simulated polluted marine atmosphere

Liyuan Xiao; Qianqian Liu; Jin Wang; Nana Chen; Junhang Chen; Jialiang Song; Xin Zhang; Kui Xiao

Journal of Materials Research and Technology (Jul 2023)

Study on corrosion mechanism of Al–Zn coatings in the simulated polluted marine atmosphere

Liyuan Xiao,
Qianqian Liu,
Jin Wang,
Nana Chen,
Junhang Chen,
Jialiang Song,
Xin Zhang,
Kui Xiao

Affiliations

Liyuan Xiao: Institute of Advanced Materials and Technology, University of Science and Technology Beijing, Beijing, 100083, China
Qianqian Liu: Institute of Advanced Materials and Technology, University of Science and Technology Beijing, Beijing, 100083, China
Jin Wang: Research Institute, JISCO Hongxing Iron and Steel Co. Ltd., Jiayuguan, 735100, China
Nana Chen: Institute of Advanced Materials and Technology, University of Science and Technology Beijing, Beijing, 100083, China
Junhang Chen: Institute of Advanced Materials and Technology, University of Science and Technology Beijing, Beijing, 100083, China
Jialiang Song: Institute of Advanced Materials and Technology, University of Science and Technology Beijing, Beijing, 100083, China
Xin Zhang: Institute of Advanced Materials and Technology, University of Science and Technology Beijing, Beijing, 100083, China
Kui Xiao: Institute of Advanced Materials and Technology, University of Science and Technology Beijing, Beijing, 100083, China; Corresponding author.

Journal volume & issue: Vol. 25
pp. 6446 – 6458

Abstract

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The corrosion behavior of Al–Zn coatings on steel sheets in simulating polluted marine atmosphere was systematically evaluated by weight loss tests, potentiodynamic polarization curves, electrochemical impedance spectroscopy, and acid salt spray test. The results demonstrated that the AI-Zn coating produced a passivation film of Al2O3 with good corrosion resistance, forming a thick and dense layer of insoluble corrosion products. In addition, the corrosion products such as Zn5Cl2(OH)8·H2O and NaZn4(SO4)Cl(OH)6•6H2O hindered the diffusion of corrosive substances into the coating and thus inhibited further corrosion.

Published in Journal of Materials Research and Technology

ISSN: 2238-7854 (Print); 2214-0697 (Online)
Publisher: Elsevier
Country of publisher: Netherlands
LCC subjects: Technology: Mining engineering. Metallurgy
Website: https://www.journals.elsevier.com/journal-of-materials-research-and-technology/

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