| (19) |
 |
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(11) |
EP 0 653 502 A3 |
| (12) |
EUROPEAN PATENT APPLICATION |
| (88) |
Date of publication A3: |
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09.08.1995 Bulletin 1995/32 |
| (43) |
Date of publication A2: |
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17.05.1995 Bulletin 1995/20 |
| (22) |
Date of filing: 10.11.1994 |
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| (84) |
Designated Contracting States: |
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DE FR GB |
| (30) |
Priority: |
11.11.1993 JP 282570/93
11.11.1993 JP 282574/93
27.06.1994 JP 144735/94
|
| (71) |
Applicants: |
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- NIHON PARKERIZING CO., LTD.
Chuo-ku,
Tokyo (JP)
- TOYOTA JIDOSHA KABUSHIKI KAISHA
Aichi-ken (JP)
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| (72) |
Inventors: |
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- Aoyama, Masayuki,
c/o Nihon Parkerizing Co., Ltd.
Chuo-ku,
Tokyo (JP)
- Sudo, Shuntaro,
c/o Toyota Jidosha K.K.
Toyoda-shi,
Aichi (JP)
- Konda, Shigeru,
c/o Toyota Jidosha K.K.
Toyoda-shi,
Aichi (JP)
- Kawaguchi, Hiroshi,
c/o Toyota Jidosha K.K.
Toyoda-shi,
Aichi (JP)
- Tanaka, Atsuo,
c/o Toyota Jidosha K.K.
Toyoda-shi,
Aichi (JP)
- Fukada, Arata,
c/o Toyota Jidosha K.K.
Toyoda-shi,
Aichi (JP)
|
| (74) |
Representative: Hale, Stephen Geoffrey |
|
J.Y. & G.W. Johnson
Furnival House
14/18 High Holborn
London WC1V 6DE
London WC1V 6DE (GB) |
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| (54) |
Zinc-containing metal-plated composite steel article and method of producing the same |
(57) A zinc-containing metal-plated composite steel article having an enhanced paint-coating
property has 0.3 to 3.0 g/m² of a zinc phosphate composite coating layer formed on
a zinc-containing metal-plated steel substrate by a cathodic electrolysis treatment
or a first chemical conversion treatment and including zinc and phosphorus in a weight
ratio Zn/P of 2.504:1 to 3.166:1 and 0.06 to 9.0% by weight of Fe, Co, Ni, Ca, Mg
and/or Mn, and a phosphate chemical conversion layer formed on the composite coating
layer by a second chemical conversion treatment and including fine phosphate crystals.