Title:
METHOD FOR REGENERATING USED ELECTROLESS NICKEL PLATING SOLUTION AND DEVICE THEREFOR
Document Type and Number:
Japanese Patent JP2769774
Kind Code:
B2
Abstract:
PURPOSE: To selectively remove phosphorous acid compds. from a used electroless Ni plating soln. without precipitating Ni ions and to reutilize the used soln. by adding calcium hydroxide as a treating agent to the used soln.
CONSTITUTION: Ammonium hydroxide is added to a used electroless Ni plating soln. contg. an oxidized hypophosphite by 0.2-4mol, preferably 1.8-2.2mol per 1mol Ni ions in the used soln. and then a phosphorous acid treating agent contg. one or more of hydroxides of Ca, Ba and Sr is added. Phosphorous acid compds. are selectively removed from the used soln. without precipitating Ni ions and the used soln. is reutilized.
More Like This:
Inventors:
Saito Tetsuo
Tomoji Koji
Shinichi Kuwana
Tomoji Koji
Shinichi Kuwana
Application Number:
JP29405393A
Publication Date:
June 25, 1998
Filing Date:
October 29, 1993
Export Citation:
Assignee:
Tochigi Prefecture
Kuwana Shoji Co., Ltd.
Kuwana Shoji Co., Ltd.
International Classes:
C23C18/31; C23C18/16; C23C18/36; (IPC1-7): C23C18/16
Domestic Patent References:
| JP363557B1 |
Attorney, Agent or Firm:
Toshio Hirayama