Method for improving the protection against corrosion of a surfa

Details Method for improving the protection against corrosion of a surfa Method for improving the protection against corrosion of a surfa

1997-03-06

2000-08-22

King, Roy V.

Coating processes

Magnetic base or coating

427250, 4273831, 4273833, 427124, B05D 512

Patent

active

061068942

ABSTRACT:
NdFeB magnets are very sensitive to corrosion and are provided, among other things, with a layer of aluminum in order to improve their resistance to corrosion. To improve the resistance of an aluminum-coated article, such as the NdFeB magnet, the magnet with the aluminum coating is subjected to a heat treatment at a temperature lower than the melting temperature of the aluminum, which heat treatment improves the resistance to corrosion when subjected to a humid atmosphere at an elevated temperature.

REFERENCES:
patent: 4935080 (1990-06-01), Hassell et al.
patent: 5399438 (1995-03-01), Tateishi et al.
Qin et al, J. Appl. Phys. 79(8) pp. 4854-4856, Apr. 15, 1996.
T. Minowa, "Coating Technology on Nd Magnet", Gorham International Conference, Feb. 26-28, 1989. No page number available!.
Abstract of Soviet Union 549266 of May 30, 1977. No page number available!.
Ahmed et al, "Ion Vapour Deposition for Corrosion Protection of Permanent Magnets", ERA Technol. XP00007505, Letterhead, UK, Jun. 20-21, 1989, pp. 8.3.1-8.3.9.

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