Tin-plated steel plate and process for producing the tin-plated steel plate
A technology of tin-plated steel sheet and manufacturing method, which is applied in hot-dip plating process, coating of superimposed layers, phosphating, etc., can solve problems such as reduction of coating adhesion, failure to suppress deterioration of appearance, etc., and achieve low-cost chemical conversion Treatment, effect of suppressing deterioration of the appearance
Active Publication Date: 2014-02-26
JFE STEEL CORP
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Problems solved by technology
[0005] However, in the chemical conversion coatings described in Patent Documents 1 to 4, the deterioration of appearance or the reduction of paint adhesion due to oxidation of the tin-plated surface cannot be suppressed compared with conventional chromate coatings.
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[0038] Using the following steel sheets as raw steel sheets, a commercially available tin plating bath was used to form a Sn layer according to the amount of Sn deposited on each surface shown in Table 3. After that, a reflow treatment was performed at a temperature above the melting point of Sn to form an Fe layer on the steel sheet A. - Sn-containing coating of Sn layer / Sn layer, and a Sn-containing coating of Fe-Ni layer / Fe-Ni-Sn layer / Sn layer is formed on steel plate B, wherein the above-mentioned original steel plate is steel plate A: plate thickness 0.2 mm low-carbon cold-rolled steel plate, or steel plate B: 100 mg / m per surface using a Watt bath 2 The amount of adhesion is to form a nickel coating on both surfaces of a low-carbon cold-rolled steel sheet with a thickness of 0.2 mm, and then, in 10 volume% H 2 +90vol%N 2 A steel plate that is annealed at 700°C in an atmosphere to diffuse and infiltrate the nickel coating.
[0039] Then, in order to remove the Sn oxide...
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Abstract
A tin-plated steel sheet includes an Sn-containing plating layer in which the mass per unit area of Sn is 0.05 to 20 g / m 2 and which is disposed on at least one surface of the steel sheet; a first chemical conversion coating which contains P and Sn, in which the mass per unit area of P is 0.3 to 10 mg / m 2 , and which is disposed on the Sn-containing plating layer; and a second chemical conversion coating which contains P and Al, in which the mass per unit area of P is 1.2 to 10 mg / m 2 and the mass per unit area of Al is 0.24 to 8.7 mg / m 2 , and which is disposed on the first chemical conversion coating. The steel sheet can suppress a degradation of appearance and a reduction in paint adhesion caused by the oxidization of the tin-plated surface without using Cr and can be subjected to chemical conversion treatment at low cost.
Description
technical field [0001] The present invention relates to a tin-plated steel sheet used for DI cans, food cans, beverage cans, etc., and more particularly to a tin-plated steel sheet having a chemical conversion treatment film not containing chromium (Cr) on the surface, and a method for producing the same. Background technique [0002] As surface-treated steel sheets for cans, tin-plated steel sheets conventionally called "tinplate" are widely used. Usually, in such a tin-plated steel sheet, a chromate coating is formed on the tin-plated surface by immersing the steel sheet in an aqueous solution containing a hexavalent chromium compound such as dichromic acid, or by chromate treatment such as electrolysis in the solution. . This is because by forming a chromate film, it prevents the oxidation of the tin-plated surface that is likely to occur during long-term storage, suppresses the deterioration (yellowing) of the appearance, and prevents the formation of tin (Sn) oxide fil...
Claims
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IPC IPC(8): C23C28/00C23C22/08C23C22/20C25D11/36
CPCC25D3/30C23C2/26C25D5/48C23C28/34C23C22/08C23C22/20C23C2/28C23C28/322C23C28/321C23C22/73C23C2/08C25D11/36C25D5/10C23C22/07C23C28/00
Inventor 铃木威中村纪彦岩佐浩树
Owner JFE STEEL CORP