Title:
NICKEL PLATING METHOD FOR CORROSION RESISTANT MINIATURIZED MAGNET
Document Type and Number:
Japanese Patent JP2001135540
Kind Code:
A
Abstract:
To prevent the rectangle of a demagnetizing curve from being lowered after plating concerning an Nd-Fe-B sintered magnet, for which nickel plating is applied to the surface, in micro-form, with which the value of S/V is greater than 1 mm-1 and unit weight is less than 1g when a surface area is S mm2 and volume is V mm3.
A plating liquid is made flow or further a nitrogen gas or inert gas is bubbled in the plating liquid or pressure around the plating liquid is kept in a pressure reducing state. Thus, the quantity of hydrogen solved in the plating liquid is reduced and the quantity of hydrogen contained in a magnet having a coating is made less than 100 ppm.
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Inventors:
MAKITA AKIRA
NOMI MASAO
SAIGO TSUNEKAZU
NOMI MASAO
SAIGO TSUNEKAZU
Application Number:
JP31911199A
Publication Date:
May 18, 2001
Filing Date:
November 10, 1999
Export Citation:
Assignee:
SUMITOMO SPEC METALS
International Classes:
H01F1/053; C25D5/08; C25D5/40; C25D7/00; C25D17/18; C25D21/04; H01F41/02; (IPC1-7): H01F41/02; C25D5/08; C25D7/00; C25D17/18; C25D21/04; H01F1/053
Attorney, Agent or Firm:
Shigenobu Ikejou (1 person outside)
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