Stock material or miscellaneous articles – All metal or with adjacent metals – Composite; i.e. – plural – adjacent – spatially distinct metal...
Patent
1996-11-27
1998-10-27
Thibodeau, Paul J.
Stock material or miscellaneous articles
All metal or with adjacent metals
Composite; i.e., plural, adjacent, spatially distinct metal...
428624, 428646, 428648, 428658, 428659, 428680, 428681, 428682, 428684, 4273981, 427405, 427433, 148530, B21D 3900, B32B 1501, B05D 136, C21D 109
Patent
active
058276181
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
This invention relates to a rust-proofing steel sheet mainly used for fuel tanks of automobiles or for wiring members of electric (and electronic) appliances, and a production method thereof.
BACKGROUND ART
A lead-tin alloy plated steel sheets having excellent corrosion resistance, press formability, solderability (weldability), etc., have been mainly used as a material for fuel tanks in the past, and have found a widespread applications as fuel tanks for automobiles. A Zn--Sn alloy plated steel sheet is excellent in corrosion resistance and solderability (weldability) because it contains tin besides zinc, and has been used for wiring members of electric (and electronic) appliances. This Zn--Sn alloy plated steel sheet has been produced mainly by an electroplating method which conducts electrolysis in an aqueous solution containing Zn--Sn ions when Zn--Sn alloy plating containing 3 to 20 wt % of tin is carried out as described, for example, in Japanese Unexamined Patent Publication (Kokai) No. 52-130438.
On the other hand, a hot-dip plating method is also available for the Zn--Sn alloy plated steel sheet. Because this method can increase relatively easily the deposition quantity of plating, the products produced by this method have been used under severe environments such as fuel tanks and for outdoor use. As to this hot-dip plating method, Japanese Examined Patent Publication (Kokoku) No. 52-35016, for example, discloses an example in which a steel sheet obtained by hot-dip plating of more than 80 to 98 wt % of tin and 2 to less than 20 wt % of zinc is used for fuel tanks of automobiles and oil tanks of kerosine stoves. Japanese Unexamined Patent Publication (Kokai) No. 4-214848 describes a plated article obtained by plating an iron type plated material by Zn--Sn alloy plating containing 70 to 98 wt % of tin, and a production method thereof. Further, Japanese Unexamined Patent Publication (Kokai) Nos. 3-229846 and 5-263208 describe a zinc type plated article obtained by serially plating a tin-containing alloy layer as a hot-dip galvanized layer on an iron type substrate, or a chromium plating layer on an alloy layer containing zinc and aluminum, a production method thereof. Japanese Unexamined Patent Publication (Kokai) Nos. 5-9786 and 6-116749 disclose a steel sheet obtained by serially plating tin and nickel and a second plating layer containing them on nickel, cobalt and a first plating layer containing them, whereby tin and nickel have lower melting points than nickel and cobalt, then conducting plastic forming and thereafter conducting heat-treatment, components made by such a steel sheet, and weldable pipes such as fuel pipings of automobiles.
Further, Japanese Examined Patent Publication (Kokoku) No. 63-66916 discloses a steel sheet for an alcohol-containing fuel, which is obtained by applying a Sn--Zn alloy plating layer to a low carbon steel to which alloy elements such as chromium, aluminum, titanium, niobium, etc., are added.
However, the prior art technologies described above are not free from the following drawbacks.
First of all, while the use of the Pb--Sn plated steel sheet can secure the corrosion resistance requirements for the service life of automobiles, press formability capable of press forming in match with a complicated structure of a car bottom portion and solderability and weldability capable of bonding fuel tank components, the Pb--Sn plated steel sheet contains lead and is not therefore preferable in view of the environmental restrictions such as the restriction of elution of lead from industrial wastes such as shredder dust.
On the other hand, the use of the Sn--Zn plated steel sheet by electroplating described above can improve the solderability and corrosion resistance, but this method involves problems in productivity and economy for the following reason. A plated steel sheet having a greater plating deposition quantity is necessary for environments where long-term corrosion resistance is required, such as a fuel tanks, but because control of the deposit
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Fuda Masahiro
Okada Nobuyoshi
Omori Takayuki
Oyagi Yashichi
Sawada Ken
Nippon Steel Corporation
Rickman Holly C.
Thibodeau Paul J.
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