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Sealing of anodized magnesium alloy AZ31 with MgAl layered double hydroxides layers
Gen Zhang1, Liang Wu1,2, Aitao Tang1,2
1College of Materials Science and Engineering, Chongqing University Chongqing 400044 China wuliang@cqu.edu.cn tat@cqu.edu.cn +86 17783101968 +86 23 65106121.
Abstract:
In this work, anodized magnesium alloy AZ31 with and without boiling water sealing was pre-prepared, and then MgAl-layered double hydroxide (LDH) films were fabricated on it through hydrothermal chemical conversion of the pre-prepared anodic layer. The morphology, structure, and composition of the films were characterized by XRD, SEM, EDS, FT-IR, XPS and GDOES. It was found that the porosity of the films was reduced after in situ fabrication of the LDHs. The effects of boiling water sealing treatment on the anodized substrate were also discussed. Moreover, the polarization curve, EIS, and immersion tests showed that LDHs fabricated on the anodized substrate with boiling water sealing treatment exhibited a significant long period of protection for the substrate.
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