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Microstructure and Corrosion Behavior of Laser Surface Alloyed Magnesium Alloys with TiO2-CeO2

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Abstract

TiO2–CeO2 ceramic oxides were prepared on magnesium alloys by laser surface alloying for corrosion protection. The microstructure and composition of laser modified surfaces were characterized by scanning electron microscopy (SEM), transmission electron microscope (TEM), optical microscope (OM), energy-dispersive spectroscopy (EDS) and X-ray diffraction (XRD). The corrosion behavior was analyzed by electrochemical and salt spray tests. The effect of relative proportion between the two ceramic components on corrosion resistance of laser alloyed magnesium alloys was investigated. Results showed that there was a margin improvement in corrosion resistance after laser surface alloying with TiO2 and CeO2 at the ratio of 4 : 1 (wt %) due to the protection effect of oxides. When the content of CeO2 increased, and the ratio of TiO2 and CeO2 was 1 : 4 (wt %), defects were introduced for the poor compatibility between CeO2 and Mg matrix. The defects speed up the failure of the layer, and the corrosion resistance was even decreased compared with the as-received magnesium alloy.

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FUNDING

The authors acknowledge the financial supports by National Natural Science Foundation of China (Grant nos. 51505464 and 51475444).

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Authors and Affiliations

  1. State Key Laboratory of Solid Lubrication, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, 730000, Lanzhou, P.R. China

    Lingqian Wang, Jiansong Zhou, Youjun Yu & Chun Guo

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  1. Lingqian Wang
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  2. Jiansong Zhou
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  3. Youjun Yu
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  4. Chun Guo
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Correspondence to Jiansong Zhou.

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Wang, L., Zhou, J., Yu, Y. et al. Microstructure and Corrosion Behavior of Laser Surface Alloyed Magnesium Alloys with TiO2-CeO2. Prot Met Phys Chem Surf 55, 729–734 (2019). https://doi.org/10.1134/S2070205119040282

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  • DOI: https://doi.org/10.1134/S2070205119040282

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