Method for the preparation of a highly corrosion resistant rare

Details Method for the preparation of a highly corrosion resistant rare Method for the preparation of a highly corrosion resistant rare

1996-06-12

1998-11-24

Pianalto, Bernard

Coating processes

Direct application of electrical, magnetic, wave, or...

Sonic or ultrasonic

427127, 427193, 427199, 427204, 4273762, B60B 100

Patent

active

058403752

ABSTRACT:
A rare earth-based permanent magnet such as a neodymium-iron-boron permanent magnet, which is disadvantageous in respect of the low corrosion resistance, can be imparted with high corrosion resistance by providing the surface with a protective coating film of vitrified alkali metal silicate, e.g., sodium silicate, of which the SiO.sub.2 :(alkali metal oxide) molar ratio is in the range from 1.5 to 20. The vitrified alkali metal silicate-based protective coating film can be formed by coating the surface of the magnet with an aqueous coating solution containing sodium silicate to form a coating layer which is dried and subjected to a heat treatment at 50.degree. to 450.degree. C. to effect vitrification of the alkali metal silicate. The thickness of the thus formed protective coating film should be in the range from 5 nm to 10 .mu.m. The protective effect of the vitrified sodium silicate-based coating film can be further improved by admixing the coating solution with finely divided silica particles of 5 to 50 nm average particle diameter.

REFERENCES:
patent: 4983231 (1991-01-01), Yamanaka et al.

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