Corrosion Behavior of Microarc Oxidized Alumina Films in High Temperature NaCl Solution

Journal of Chinese Society for Corrosion and protection

2013, Vol. 33

Issue (1): 17-22 DOI:

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Corrosion Behavior of Microarc Oxidized Alumina Films in High Temperature NaCl Solution

XU Ke¹, XIAO Shubin², LIU Yanhui¹, RUAN Guoling¹

1. The Institute of Seawater Desalination and Multipurpose Utilization, SOA, Tianjin 300192, China;
2. College of Chemistry and Molecular Engineering, Qingdao University of Science and Technology, Qingdao 266042, China

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Abstract

Abstract：The corrosion behaviors of microarc oxidized 5052 alumina immersed in 70 ℃/7% NaCl solutions with different time were studied through the open circuit potential (OCP) and electrochemical impedance spectroscopy (EIS) measurements. The results reveal that high temperature solution could permeate through microarc oxidation films and induce the corrosion of aluminum alloy substrate in the initial stage. After that, the corrosion products depositing in film defects could block the permeation of solution, which make microarc oxidation films exhibiting a self-sealing ability. And the film resistance keeps mostly unchangeable after initial rapidly decrease. Sealing treatment of microarc oxidation film could improve the self-sealing ability effectively.

Key words: microarc oxidation aluminum alloy corrosion EIS self-sealing

ZTFLH:

TG172.5

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Cite this article:

XU Ke,XIAO Shubin,LIU Yanhui,RUAN Guoling. Corrosion Behavior of Microarc Oxidized Alumina Films in High Temperature NaCl Solution. Journal of Chinese Society for Corrosion and protection, 2013, 33(1): 17-22.

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https://www.jcscp.org/EN/ OR https://www.jcscp.org/EN/Y2013/V33/I1/17

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