Title:
METHOD FOR ACID CHEMICAL CONVERSION OF METAL MATERIAL
Document Type and Number:
Japanese Patent JP3181658
Kind Code:
B2
Abstract:
PURPOSE: To accurately control the film thickness of a chemical conversion film of Al-base metal material by detecting the dropping amt. of titrant to the inflection point of potential curve of F ion electrode.
CONSTITUTION: When the ion concn. of fluorides in an acid chemical conversion treating liquid is measured, potentiometric titration is performed without controlling pH by using a soln. containing Al, La, Y, Zr, Ga, Ce or Be ions as a titrant and the F ion electrode as the indicator electrode. The dropping amt. of the titrant to the inflection point of the potential curve of the F ion electrode is determined, and thereby, thickness of the chemical conversion film formed on an Al-base metal material by using a fluorine-contg. acid chemical conversion liquid is accurately controlled and the effective F concn. can be measured by a simple method.
Inventors:
Yasuo Asai
Yuzuru Matsubara
Hitoshi Ishii
Yuzuru Matsubara
Hitoshi Ishii
Application Number:
JP2442992A
Publication Date:
July 03, 2001
Filing Date:
January 13, 1992
Export Citation:
Assignee:
Nihon Parkerizing Co., Ltd.
International Classes:
C23C22/34; C23C22/77; G01N27/26; G01N31/16; (IPC1-7): C23C22/77; G01N27/26
Domestic Patent References:
| JP4297585A | ||||
| JP63238286A | ||||
| JP1142087A | ||||
| JP432578A |
Attorney, Agent or Firm:
Takuo Murai