Method for surface treatment of a magnetic amorphous alloy

Details Method for surface treatment of a magnetic amorphous alloy Method for surface treatment of a magnetic amorphous alloy

1984-05-11

1985-02-05

Pianalto, Bernard D.

Coating processes

Magnetic base or coating

428900, H01F 1002

Patent

active

044978502

ABSTRACT:
The present invention relates to a method for forming on a magnetic amorphous alloy a film which is extremely thin, insulating, and corrosion-resistant and, particularly, can prevent secular deterioration of magnetic properties due to changing of the surface properties of the magnetic amorphous alloy.
The method of the present invention comprises the steps of: applying, on the surface of the magnetic amorphous alloy, a predetermined amount of an acidic solution containing chromic acid, phosphoric acid, and a fluorine compound; and drying and baking the acidic aqueous solution, thereby forming, on the magnetic amorphous alloy, a film substantially comprised of a chromium and a phosphoric compound.

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