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Hyperfine Interactions

, Volume 46, Issue 1–4, pp 467–471 | Cite as

Enhanced corrosion resistance in Nd15Fe77B8 by laser surface amorphization

  • J. V. Armstrong
  • J. M. D. Coey
  • J. G. Lunney
  • M. E. G. Lyons
Corrosion

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.

Keywords

Corrosion Resistance Corrosion Rate Laser Treatment Excimer Laser Potentiodynamic Polarization 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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References

  1. [1]
    J. Jacobson and A. Kim, J. Appl. Phys. 61 (1987) 3763.CrossRefADSGoogle Scholar
  2. [2]
    C.J. Willman and K.S.V.L. Narasimhan, J. Appl. Phys. 61 (1987) 3766.CrossRefADSGoogle Scholar
  3. [3]
    R. Schulz, N.L. Lee and B.M. Clemens, J. Mater. Res. 2 (1987) 46.ADSGoogle Scholar
  4. [4]
    R.S. Bhattacharya, A.K. Rai, C.N. Raffoul, P.P. Pronko and M. Khobaib, J. Vac. Sci. Technol. A 3 (1985) 2680.CrossRefADSGoogle Scholar
  5. [5]
    K.R. Swanswon and J.J. Spijkerman, J. Appl. Phys. 41 (1970) 3155.CrossRefGoogle Scholar
  6. [6]
    K. Moorjani and J.M.D. Coey, in Magnetic Glasses, (Elsevier, Amsterdam, 1984).Google Scholar
  7. [7]
    J.W. McCamy, M.J. Godbole, A.J. Pedraza and D.H. Lowndes, J. Mater. Res. 1 (1986) 629.ADSGoogle Scholar

Copyright information

© J.C. Baltzer A.G., Scientific Publishing Company 1989

Authors and Affiliations

  • J. V. Armstrong
    • 1
  • J. M. D. Coey
    • 1
  • J. G. Lunney
    • 1
  • M. E. G. Lyons
    • 2
  1. 1.Department of Pure and Applied PhysicsTrinity CollegeDublin 2Ireland
  2. 2.Department of ChemistryTrinity CollegeDublin 2Ireland

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