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Evaluation of anticorrosive behaviour of ZnO nanotetra-pods on a AZ91-grade Mg alloy

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Abstract

Highly cross-linked zinc oxide (ZnO) with the nanorod morphology of tetra-pods was successfully prepared using a microwave irradiation (MWI) technique. In comparison with the available conventional techniques, the MWI technique has the advantage of producing different morphological structures with high purity and in a shorter reaction time. These tetra-pods consist of a ZnO core in the zinc blende from which four ZnO arms emerge in the wurtzite structure. In this investigation, the effects of irradiation times and the growth mechanism of ZnO nanotetra-pods were discussed. The structural, morphological and optical properties of ZnO nanorods were investigated by field emission scanning electron microscopy, X-ray diffraction, an ultra violet visible spectrometry and energy-dispersive spectroscopy. The electrochemical corrosion behaviours of an AZ91-grade Mg alloy and a ZnO/PN nanotetra-pod-coated Mg alloy were investigated. The Tafel plot revealed that the corrosion of Mg drastically decreased on coating with a thin layer of ZnO nanotetra-pods and PN (Mg/PN/ZnO) compared to Mg in a KOH electrolyte.

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Acknowledgements

One of the authors, M Selvam, is grateful to the Department of Science and Technology (DST), New Delhi, for providing the INSPIRE fellowship (IF110749) to carry out this research work.

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Authors and Affiliations

  1. Department of Nanoscience and Technology, K.S. Rangasamy College of Technology, KSR Kalvi Nagar, Tiruchengode, 637215, India

    R Brindha, S S Raja Ajith, M Nandhini & M Selvam

  2. Material Science and Engineering Program, Multi-Disciplinary Unit, Faculty of Science, Mahidol University, Bangkok, 73170, Thailand

    Kittitat Subannajui & Kittikhun Khotmungkhun

  3. Department of Physics, Sethu Institute of Technology, Kariapatti, 626115, India

    K Sakthipandi

Authors
  1. R Brindha
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  2. S S Raja Ajith
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  3. M Nandhini
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  4. M Selvam
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  5. Kittitat Subannajui
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  6. Kittikhun Khotmungkhun
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  7. K Sakthipandi
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Correspondence to M Selvam.

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Brindha, R., Ajith, S.S.R., Nandhini, M. et al. Evaluation of anticorrosive behaviour of ZnO nanotetra-pods on a AZ91-grade Mg alloy. Bull Mater Sci 42, 221 (2019). https://doi.org/10.1007/s12034-019-1907-0

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  • DOI: https://doi.org/10.1007/s12034-019-1907-0

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