Corrosion resistance of Mg–Al-LDH coating on magnesium alloy AZ31

Mg–Al-layered double hydroxide (LDH) coatings were fabricated by a combined co-precipitation method and hydrothermal process on an AZ31 alloy substrate. The characteristics of the coatings were investigated using SEM, XRD, FT-IR and EDS. The corrosion resistance of the LDH coatings was studied using...

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Bibliographic Details
Published in:Surface & coatings technology 2014-11, Vol.258, p.1152-1158
Main Authors: Zhang, Fen, Liu, Zhen-Guo, Zeng, Rong-Chang, Li, Shuo-Qi, Cui, Hong-Zhi, Song, Liang, Han, En-Hou
Format: Article
Language:English
Subjects:
Applied sciences
Coating
Coprecipitation
Corrosion
Corrosion environments
Corrosion resistance
Cross-disciplinary physics: materials science
rheology
Exact sciences and technology
Layered double hydroxide
Magnesium
Magnesium alloy
Magnesium base alloys
Materials science
Metals. Metallurgy
Nanostructure
Physics
Polarization
Production techniques
Protective coatings
Surface treatment
Surface treatments
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Summary:Mg–Al-layered double hydroxide (LDH) coatings were fabricated by a combined co-precipitation method and hydrothermal process on an AZ31 alloy substrate. The characteristics of the coatings were investigated using SEM, XRD, FT-IR and EDS. The corrosion resistance of the LDH coatings was studied using potentiodynamic polarization and electrochemical impedance spectrum. The results demonstrated that the LDH coatings, characterized by nanoplates stacked vertically to the substrate surface and ion-exchange ability, possess excellent corrosion resistance. •The microstructure of the LDH coatings was composed of the nanoplates.•The LDH-coated alloys possess excellent anticorrosion property.•The LDH coatings possess the ion-exchangeability.
ISSN:0257-8972
1879-3347
DOI:10.1016/j.surfcoat.2014.07.017