Title:
TREATMENT BEFORE PLATING OF ZINC-ALUMINUM ALLOY
Document Type and Number:
Japanese Patent JPH04297584
Kind Code:
A
Abstract:
PURPOSE: To improve the adhesion of plating in the subsequent plating treatment by treating a zinc-aluminum alloy by a weak alkali soln. and thereafter treating it by a strong alkali soln.
CONSTITUTION: In pretreatment at the time of plating a zincaluminum alloy, in a primary stage, this alloy is treated by a weak alkali soln. of ≤pH13, and the part rich in aluminum in the allay is etched. Next, the allay is treated with a strong alkali soln. of ≥pH13, and zinc and aluminum are simultaneously etched to obtain an active state on the surface of the allay. As a result, smuts are not generated, and the adhesion in the subsequent plating treatment can be improved.
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Inventors:
OHARA MUNEHARU
NISHISAKA TSUYOSHI
SAKAI HISAO
SUZUKI MITSUO
SATO KOICHI
NISHISAKA TSUYOSHI
SAKAI HISAO
SUZUKI MITSUO
SATO KOICHI
Application Number:
JP6325691A
Publication Date:
October 21, 1992
Filing Date:
March 27, 1991
Export Citation:
Assignee:
MITSUI MINING & SMELTING CO
International Classes:
C23C18/18; C23F1/40; C23G1/20; (IPC1-7): C23C18/18; C23F1/40; C23G1/20
Attorney, Agent or Firm:
Hidetoshi Mitsuishi (1 person outside)