Enhanced corrosion resistance in Nd15Fe77B8 by laser surface amorphization
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.
KeywordsCorrosion Resistance Corrosion Rate Laser Treatment Excimer Laser Potentiodynamic Polarization
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