Stock material or miscellaneous articles – All metal or with adjacent metals – Composite; i.e. – plural – adjacent – spatially distinct metal...
Patent
1995-12-05
1999-01-19
Zimmerman, John J.
Stock material or miscellaneous articles
All metal or with adjacent metals
Composite; i.e., plural, adjacent, spatially distinct metal...
428658, 428659, 428935, 428936, 205255, 427438, B32B 1518, C25D 356, C23C 2800
Patent
active
058612181
DESCRIPTION:
BRIEF SUMMARY
This application is an application filed under 35 U.S.C. 371 from PCT/JP95/01947 Sep. 26, 1995.
FIELD OF THE INVENTION
The present invention relates to a zinciferous plated steel sheet, and more particularly, to a zinciferous plated steel sheet which is excellent in press-formability, and furthermore, is excellent in at least one of spot-weldability, adhesiveness and chemical treatability, depending upon the use, and a method for manufacturing same.
BACKGROUND OF THE INVENTION
Because of the various excellent advantages, zinciferous plated steel sheets are widely applied as various rust-preventive steel sheets. In order to use these zinciferous plated steel sheets as rust-preventive steel sheets for automobile, it is important for these steel sheets to be excellent in press-formability, spot-weldability, adhesiveness and chemical treatability as properties required in the manufacturing step of automobile bodies, in addition to corrosion resistance and painting adaptability.
The zinciferous plated steel sheet is however defective in that it is low in press-formability in general as compared with a cold-rolled steel sheet. This is attributable to a large sliding resistance between the zinciferous plated steel sheet and a die of a press as compared with sliding resistance between the cold-rolled steel sheet and a die of a press. More specifically, since the zinciferous plated steel sheet has a large sliding resistance, it becomes difficult for the zinciferous plated steel sheet to flow into the die of the press at a portion where sliding resistance between a bead of the die of the press and the zinciferous plated steel sheet is very large, and fracture tends to easily occur in the zinciferous plated steel sheet.
A method which comprises applying a high-viscosity lubricant oil onto the surface of a zinciferous plated steel sheet is commonly used as a method for improving press-formability of the zinciferous plated steel sheet. This method has however drawbacks in that the high-viscosity of the lubricant oil causes a defective degreasing, which results in a painting defect in the painting step, and lack of the lubricant oil during the press-forming causes unstable press-formability. There is therefore a strong demand for improvement of press-formability of the zinciferous plated steel sheet.
During the spot-welding of the zinciferous plated steel sheet, on the other hand, a copper electrode reacts with molten zinc, and this tends to form a brittle alloy phase. A problem in the zinciferous plated steel sheet is therefore that wear of the copper electrode is serious, leading to a short service life thereof, and as a result, the zinciferous plated steel sheet is poorer in continuous spot-weldability than the cold-rolled steel sheet.
In the manufacturing step of an automobile body, furthermore, various adhesive agents are used for the purposes of rust prevention and inhibition of vibration of the automobile body. Recently, however, adhesiveness of the zinciferous plated steel sheet has been found to be lower than that of the cold-rolled steel sheet.
As a method for solving the above-mentioned problems, Japanese Patent Provisional Publication No. 53-60,332 published on May 30, 1978 and Japanese Patent Provisional Publication No. 2-190,483 published on Jul. 26, 1990 disclose a technology for improving weldability or workability of a zinciferous plated steel sheet, which comprises subjecting the zinciferous plated steel sheet to an electrolytic treatment, a dipping treatment, an application/oxidation treatment or a heating treatment, thereby forming an oxide film mainly comprising zinc oxide (ZnO) on the surface of the zinciferous plated steel sheet (hereinafter referred to as the "prior art 1").
Japanese Patent Provisional Publication No. 4-88,196 published on Mar. 23, 1992 discloses a technology for improving press-formability and chemical treatability of a zinciferous plated steel sheet, which comprises dipping the zinciferous plated steel sheet in an aqueous solution containing sodium phosphate in an amount
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Abstract of JP 52 152 834, "Treating galvanised steel plate before painting -with aq. acid soln. containing e.g. iron chloride, cobalt chloride or nickel chloride to give good adhesion and corrosion resistance", Derwent Publications Ltd., London, 1977, no month.
Hashimoto Satoshi
Hiraya Akira
Imokawa Toru
Inagaki Jun-ichi
Sakurai Michitaka
NKK Cororation
Zimmerman John J.
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