Title:
PHOSPHATING PROCESS
Document Type and Number:
WIPO Patent Application WO/1993/022481
Kind Code:
A1
Abstract:
A process for producing a phosphate coating, wherein a sludge, which is an impurity component other than inevitable impurities contained in a phosphating bath, is removed and the object is electrolyzed in order to enhance the capability of chemical conversion coating and provide a high-quality conversion coating. This process serves to form a satisfactory phosphate coating on whatever metallic material and can provide a phosphate coating having a large thickness which has not been available in the prior art.
Inventors:
MATSUDA SHIGEKI (JP)
Application Number:
PCT/JP1993/000593
Publication Date:
November 11, 1993
Filing Date:
April 30, 1993
Export Citation:
Assignee:
NIPPON DENSO CO (JP)
MATSUDA SHIGEKI (JP)
MATSUDA SHIGEKI (JP)
International Classes:
C25D11/34; C25D11/36; C25D21/06; (IPC1-7): C25D11/34; C25D11/36
Foreign References:
| JPH0336296A | 1991-02-15 | |||
| JPH02153098A | 1990-06-12 | |||
| JPH04268096A | 1992-09-24 | |||
| JPH0336296A | 1991-02-15 | |||
| JPS6468481A | 1989-03-14 | |||
| JPH02190478A | 1990-07-26 | |||
| JPH04120294A | 1992-04-21 |
Other References:
See also references of EP 0597131A4
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