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Tin-plated steel sheet and method for producing same

A technology for tin-plated steel sheets and steel sheets, which is applied in hot-dip galvanizing, superimposed layer plating, phosphating, etc., and can solve problems such as the reduction of paint adhesion and the inability to suppress the deterioration of appearance

Inactive Publication Date: 2013-12-18
JFE STEEL CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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.

Method used

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  • Tin-plated steel sheet and method for producing same
  • Tin-plated steel sheet and method for producing same
  • Tin-plated steel sheet and method for producing same

Examples

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Embodiment

[0045] 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 4. 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.

[0046] Then, in order to remove the Sn oxide...

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Abstract

A tinned steel sheet includes an Sn-containing plating layer which is disposed on at least one surface of a steel sheet and in which the mass per unit area of Sn is 0.05 to 20 g / m 2 ; a first chemical conversion coating which is disposed on the Sn-containing plating layer, which contains P and Sn, and in which the mass per unit area of P is 0.3 to 10 mg / m 2 ; a second chemical conversion coating which is disposed on the first chemical conversion coating, which contains P and A1, and 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 a silane coupling agent-treating layer which is disposed on the second chemical conversion coating and in which the mass per unit area of Si is 0.10 to 100 mg / m 2 . The steel sheet can suppress the deterioration of appearance and the reduction of paint adhesion due to the surface oxidation of a tin plating layer without using Cr and which can be subjected to chemical conversion 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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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C28/00C23C22/08C23C22/20C25D11/36
CPCC25D3/30C23C2/26C25D5/48C23C28/00C23C22/20C23C2222/20C23C22/73C23C22/08C25D11/36
Inventor 铃木威中村纪彦岩佐浩树
Owner JFE STEEL CORP
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