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Magnetic strength and corrosion of rare earth magnets

Release time:2017-03-30 16:34     Author:Judy

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Keywords: rare earth magnets

INTRODUCTION: AIM Magnet Co.,Ltd.

Rare earth magnets have been used in orthodontics, but their corrosion tendency in the oral cavity limits
long-term clinical application. The aim of this project was to evaluate several; magnet coatings and their
effects on magnetic flux density.
METHODS:

A total of 60 neodymium-iron-boron magnets divided into 6 equal groups--polytetrafluoroethylene-coated
(PTFE), parylene-coated, and noncoated--were subjected to 4 weeks of aging in saline solution, ball milling,
and corrosion testing.
RESULTS:

A significant decrease in magnet flux density was recorded after applying a protective layer of parylene,
whereas a slight decrease was found after applying a protective layer of PTFE. After 4 weeks of aging, the
coated magnets were superior to the noncoated magnets in retaining magnetism. The corrosion-behavior
test showed no significant difference between the 2 types of coated magnets, and considerable amounts of
iron-leached ions were seen in all groups.

CONCLUSIONS:
Throughout the processes of coating, soaking, ball milling, and corrosion testing, PTFE was a better coating
material than parylene for preserving magnet flux density. 


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