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Enhanced corrosion resistance in Nd15Fe77B8 by laser surface amorphization

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Abstract

A thin amorphous layer on a NdFeB ingot produced by surface melting using a KrF excimer laser, and subsequent self-quenching is shown to improve the corrosion resistance properties of the ingot. X-ray diffraction and conversion-electron Mössbauer confirm the amorphous nature of the laser-induced surface layer. Potentiodynamic polarization measurements before and after laser treatment show a shift of Ecorr to a more positive value (ΔEcorr∼150 mV) and a reduction in the dissolution current in the passive region. These observations are characteristic of a reduced total corrosion rate.

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Authors and Affiliations

  1. Department of Pure and Applied Physics, Trinity College, Dublin 2, Ireland

    J. V. Armstrong, J. M. D. Coey & J. G. Lunney

  2. Department of Chemistry, Trinity College, Dublin 2, Ireland

    M. E. G. Lyons

Authors
  1. J. V. Armstrong
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  2. J. M. D. Coey
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  3. J. G. Lunney
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  4. M. E. G. Lyons
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Armstrong, J.V., Coey, J.M.D., Lunney, J.G. et al. Enhanced corrosion resistance in Nd15Fe77B8 by laser surface amorphization. Hyperfine Interact 46, 467–471 (1989). https://doi.org/10.1007/BF02398232

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  • DOI: https://doi.org/10.1007/BF02398232

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