Process for the corrosion protection of neodymium-iron-boron gro

Details Process for the corrosion protection of neodymium-iron-boron gro Process for the corrosion protection of neodymium-iron-boron gro

1989-10-19

1990-04-17

Niebling, John F.

Chemistry: electrical and wave energy

Processes and products

204 387, 2041811, C25D 534, C25D 1304

Patent

active

049177788

ABSTRACT:
Disclosed is a process for the corrosion protection of a neodymium-iron-boron group sintered magnet, which comprises the steps of: immersing the neodymium-iron-boron group sintered magnet in oxidizing acid to activate the surface thereof; plating the magnet with nickel having internal stress of not more than 1000 kgf/cm.sup.2 ; and applying cationic electrodeposition coating thereto.

REFERENCES:
patent: 4837114 (1989-06-01), Hamada et al.
patent: 4857873 (1989-08-01), Gillings
patent: 4863805 (1989-09-01), Suzuki et al.

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