Ultrasonic phosphating of Nd-Fe-B magnetic alloys

Ultrasonic phosphating of ground surfaces of Nd-Fe-B magnets was performed at two ultrasound intensities. The process was shown to follow the relationships known for topochemical reactions. High-frequency processing is more efficient in suppressing the autoinhibiting adsorption of reaction intermedi...

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Bibliographic Details
Published in:Inorganic materials 2000-06, Vol.36 (6), p.580-583
Main Authors: Kosobudskii, I. D., Seryanov, Yu. V., Trepak, N. M.
Format: Article
Language:English
Subjects:
Acceleration
Cavitation
Corrosion rate
Corrosion resistance
Diffusion coating
Diffusion effects
Ferrous alloys
Magnetic alloys
Magnetic materials
Magnets
Phosphating (coating)
Protective coatings
Reaction intermediates
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Summary:Ultrasonic phosphating of ground surfaces of Nd-Fe-B magnets was performed at two ultrasound intensities. The process was shown to follow the relationships known for topochemical reactions. High-frequency processing is more efficient in suppressing the autoinhibiting adsorption of reaction intermediates promoted by Schlichting’s acoustic winds in the initial stages of phosphating and has a stronger accelerating effect on intergranular diffusion in the later stages. The low-frequency cavitation results in the erosion of the growing coating. The acceleration of solid-state diffusion prevails over the effect of cavitation heating. The high-frequency phosphating of Nd-Fe-B magnets is more attractive from the viewpoint of the growth rate and corrosion resistance of the resultant coatings.
ISSN:0020-1685
1608-3172
DOI:10.1007/BF02757957