In-situ LDHs growth on PEO coatings on AZ31 magnesium alloy for active protection: Roles of PEO composition and conversion solution

Gen Zhang; Liang Wu; Maria Serdechnova; Aitao Tang; Cheng Wang; Carsten Blawert; Fusheng Pan; Mikhail L. Zheludkevich

Journal of Magnesium and Alloys (Jul 2023)

In-situ LDHs growth on PEO coatings on AZ31 magnesium alloy for active protection: Roles of PEO composition and conversion solution

Gen Zhang,
Liang Wu,
Maria Serdechnova,
Aitao Tang,
Cheng Wang,
Carsten Blawert,
Fusheng Pan,
Mikhail L. Zheludkevich

Affiliations

Gen Zhang: Nuclear Power Institute of China, Chengdu, Sichuan 610213, China; College of Materials Science and Engineering, Chongqing University, Chongqing 400044, China; Institute of Surface Science, Helmholtz-Zentrum Hereon, Max-Planck Str. 1, Geesthacht 21502, Germany
Liang Wu: College of Materials Science and Engineering, Chongqing University, Chongqing 400044, China; National Engineering Research Center for Magnesium Alloys, Chongqing University, Chongqing 400044, China; Corresponding authors at: College of Materials Science and Engineering, Chongqing University, Chongqing 400044, China.
Maria Serdechnova: Institute of Surface Science, Helmholtz-Zentrum Hereon, Max-Planck Str. 1, Geesthacht 21502, Germany; Corresponding author.
Aitao Tang: College of Materials Science and Engineering, Chongqing University, Chongqing 400044, China; National Engineering Research Center for Magnesium Alloys, Chongqing University, Chongqing 400044, China; Corresponding authors at: College of Materials Science and Engineering, Chongqing University, Chongqing 400044, China.
Cheng Wang: Institute of Surface Science, Helmholtz-Zentrum Hereon, Max-Planck Str. 1, Geesthacht 21502, Germany
Carsten Blawert: Institute of Surface Science, Helmholtz-Zentrum Hereon, Max-Planck Str. 1, Geesthacht 21502, Germany
Fusheng Pan: College of Materials Science and Engineering, Chongqing University, Chongqing 400044, China; National Engineering Research Center for Magnesium Alloys, Chongqing University, Chongqing 400044, China
Mikhail L. Zheludkevich: Institute of Surface Science, Helmholtz-Zentrum Hereon, Max-Planck Str. 1, Geesthacht 21502, Germany; Institute for Materials Science, Faculty of Engineering, University of Kiel, Kaiserstraße 2, Kiel 24143, Germany

Journal volume & issue: Vol. 11, no. 7
pp. 2376 – 2391

Abstract

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In this work, plasma electrolytic oxidation (PEO) coatings were produced on magnesium alloy AZ31 in aluminate, silicate and phosphate- based electrolytes, and followed by hydrothermal treatments in order to synthesis layered double hydroxides (LDHs) based nanocontainers. LDHs synthesis was done in three different growth solutions (deionized water, sodium nitrate and aluminum nitrate containing solution). In frame of this work it was shown, that it was difficult to form LDHs on Si-based PEO coating, due to more stable silicate phases in comparison with aluminate and phosphate phases in respective PEO coatings. The obtained hybrid LDH/PEO coatings were characterized using SEM, EDS and GDOES, and then the corrosion protection was further investigated by EIS. Based on the obtained results, it was confirmed that, the hydrothermal treatments in Al3+ containing solution played an important role on overall corrosion resistance for phosphate and silicate-based PEO coatings, but not for Al-based PEO coatings.

Published in Journal of Magnesium and Alloys

ISSN: 2213-9567 (Online)
Publisher: KeAi Communications Co., Ltd.
Country of publisher: China
LCC subjects: Technology: Mining engineering. Metallurgy
Website: https://www.keaipublishing.com/en/journals/journal-of-magnesium-and-alloys/

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