Title:
DEVICE FOR PROLONGING LIFETIME OF ELECTROLESS NICKEL-PLATING LIQUID
Document Type and Number:
Japanese Patent JP2007291465
Kind Code:
A
Abstract:
To provide a device for prolonging the lifetime of an electroless nickel-plating liquid capable of reducing the amount of a waste liquid and reducing losses of raw material components by increasing the use frequency of continuous circulation of an electroless Ni plating liquid.
A first negative ion exchange membrane 4 which permeates hypophosphite ions, phosphite ions, and SO42-but does not permeate organic acid ions, and a first positive ion exchange membrane 5 which permeates Na+ but does not permeate Ni2+are alternately arranged in a first electrodialysis unit 1 connected to a Ni plating liquid tank 21. A second negative ion exchange membrane 14 which permeates hypophosphite ions and organic acid ions but does not permeate phosphate ions and SO42-and a second positive ion exchange membrane which permeates H+but does not permeate Ni2+are alternately arranged in a second electrodialysis unit 11 connected to its first concentration chamber 7. A second concentration chamber 17 is connected to the Ni plating liquid tank 21.
COPYRIGHT: (C)2008,JPO&INPIT
Inventors:
KOJIMA TAKASHI
YAMAMOTO MAKIKO
NEMOTO KENICHI
MINAGAWA YOSHIE
TANIOKA AKIHIKO
Application Number:
JP2006122255A
Publication Date:
November 08, 2007
Filing Date:
April 26, 2006
Assignee:
NIPPON KANIZEN KK
TOKYO INST TECH
International Classes:
C23C18/16; B01D61/44; B01D61/58; C02F1/469; C23C18/31; C23C18/36
Domestic Patent References:
| JP2002527630A | 2002-08-27 | | | |
| JP2002536644A | 2002-10-29 | | | |
| JP2002322564A | 2002-11-08 | | | |
| JP2004052029A | 2004-02-19 | | | |
Attorney, Agent or Firm:
Atsushi Aoki
Takashi Ishida
Kazuyuki Nishidate
Tetsuji Koga
