Stock material or miscellaneous articles – All metal or with adjacent metals – Composite; i.e. – plural – adjacent – spatially distinct metal...
Patent
1997-06-18
2000-01-18
Nakarani, D. S.
Stock material or miscellaneous articles
All metal or with adjacent metals
Composite; i.e., plural, adjacent, spatially distinct metal...
428626, 428632, 428659, 428684, 428413, B21D 3900, C03C 2702, B32B 2738
Patent
active
060156287
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to an organic composite coated steel sheet comprising, as the substrate base, a zinc or zinc alloy plated steel sheet, which can be used in automobile bodies and electric appliances. The organic composite coated steel sheet of the invention has good press formability, while being coated with oil, and has high perforation corrosion resistance and even high resistance to corrosion in a corrosive environment in which iron rust is present (hereinafter referred to as "corrosion resistance in a rust-contaminated environment").
BACKGROUND ART
In the step of machining steel sheets under pressure to produce automobile bodies or the like, high-viscosity press oil is scarcely used, since the steel sheets being machined in the step require efficient working, degreasing and chemical treatment. In general, therefore, the rust preventing oil coated on the steel sheets is directly used as the press oil. However, such is problematic in that the machining of the parts with complicated shapes often result in press cracking and other troubles. In order to solve the problems, expensive materials having a high mean-r value (that is, having good press formability) are employed at present in the art. Given the situation, therefore, it is desired to develop inexpensive materials with good press formability which can be machined under pressure to give any parts with complicated shapes.
On the other hand, in the field of electric appliances, steel sheets are machined in the presence of press oil, and the machined products are degreased with a freon-type solvent before use. However, the freon-type solvent is a chemical that destroys the ozone layer around the earth, and the working environment where press oil is used is not good for factory workers. For these reasons, the recent tendency is toward the development of organic composite coated steel sheets capable of being press-formed in the absence of oil.
Under the situation mentioned above, various organic composite coated steel sheets such as those mentioned below have heretofore been proposed.
(1) Japanese Patent Application laid open (KOKAI) under No. Sho 64-8033 discloses an organic composite coated steel sheet, which comprises a Zn or Zn alloy plated steel sheet having on its surface a first chromate film and a second organic film of an amine-modified epoxy resin containing silica or a chromate, in that order.
(2) Japanese Patent Application laid open (KOKAI) under No. Hei 3-284942 discloses an organic resin-coated, galvannealed steel sheet in which the organic film contains silica or a fine powder of a fluorine resin to thereby improve the anti-powdering property and the anti-flaking property of the steel sheet.
(3) Japanese Patent Application laid open (KOKAI) under No. Hei 6-173037 discloses an organic composite coated steel sheet in which the organic film contains an ether-ester type urethane resin, an epoxy resin, silica and a polyolefin wax.
(4) Japanese Patent Application laid open (KOKAI) under No. Hei 5-237449 discloses an organic composite coated steel sheet, which comprises a zinc or zinc alloy plated steel sheet having on its surface a first chromate film and a second organic film in that order, and in which the second organic film comprises a resin having hydroxyl and/or carboxyl groups, large particles of a polyolefin wax (having a mean particle size of from 3.0 to 5.0 .mu.m), small particles of a polyolefin wax (having a mean particle size of 1.0 .mu.m or smaller) and silica.
(5) Japanese Patent Application laid open (KOKAI) under No. Hei 5-65667 discloses an organic composite coated steel sheet, which comprises a zinc or zinc alloy plated steel sheet having on its surface a first chromate film and a second organic film in that order, and in which the second organic film comprises an aqueous resin, silica and two different polyolefin waxes with a molecular weight of from 1000 to 4000, one polyolefin wax having a softening point of 120.degree. C. or lower while the other having a softening point of higher than 120.
REFERENCES:
patent: 4775600 (1988-10-01), Adaniya et al.
patent: 4876160 (1989-10-01), Shindou et al.
patent: 5061575 (1991-10-01), Mohri et al.
patent: 5102746 (1992-04-01), Shindou et al.
Galvatech '92 "The Corrosion Resistance of Organic Composite-Caoted Steel Sheets"; Toshiaki Shiota, et al. pp. 372-376.
Copy of the International Search Report dated Sep. 24, 1996.
Haruta Yasuhiko
Kubota Takahiro
Urata Kazuya
Yamashita Masaaki
Yoshimi Naoto
Nakarani D. S.
NKK Corporation
Rickman Holly C
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