Tinned steel sheet excellent in corrosion resistance

A technology of tin-plated steel plate and corrosion resistance, applied in the field of uncoated cans, can solve the problems of insufficient corrosion resistance of tin-plated steel plate, and achieve excellent corrosion resistance and Sn elution inhibition effect.

Inactive Publication Date: 2009-03-11
NIPPON STEEL CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, after conducting various studies, it was found that in the case where the tinned steel sheet is manufactured by pre-plating of Ni plating or Fe-Ni alloy plating followed by tin plating and melting treatment, even if the ATC value is lowered, the tinned steel sheet is still Has insufficient corrosion resistance

Method used

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  • Tinned steel sheet excellent in corrosion resistance
  • Tinned steel sheet excellent in corrosion resistance
  • Tinned steel sheet excellent in corrosion resistance

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0079] Tin-plated steel sheets were prepared for the corrosion resistance test, and the tin-plated steel sheets were prepared by the following sequence of steps (1)-(4): (1) using the above-mentioned Fe-Ni alloy plating condition 1 at 0.21 mm thick Carry out Fe-Ni alloy plating to have 8mg / m on the cold-rolled steel plate that has degreased and pickled 2 of Ni; (2) use the above Fe plating conditions to perform Fe plating to have 10mg / m 2 of Fe; (3) Sn plating is carried out using the above Sn plating conditions to have 5.7g / m 2 of Sn, followed by melt treatment; and (4) chemical treatment using the above chemical treatment conditions to form a chromium metal equivalent of 9 mg / m 2 chemical treatment layer.

Embodiment 2

[0081] A tin-plated steel sheet was prepared for the corrosion resistance test, and the tin-plated steel sheet was prepared by the following sequence of steps (1)-(5): (1) using the above-mentioned Fe-Ni alloy plating condition 1 at a thickness of 0.21mm Carry out Fe-Ni alloy plating to have 155mg / m 2 Ni; (2) Sn plating is performed using the above Sn plating conditions to have 0.8g / m 2 Sn, and then carry out melting treatment; (3) use the above-mentioned Fe-Ni alloy plating condition 2 to carry out plating Fe-Ni alloy to have 25mg / m 2 of Ni; (4) use the above Sn plating conditions to perform Sn plating to have 13.5g / m 2 of Sn, followed by melt treatment; and (5) chemical treatment using the above chemical treatment conditions to form a chromium metal equivalent of 9 mg / m 2 chemical treatment layer.

Embodiment 3

[0083] Tin-plated steel sheets were prepared for the corrosion resistance test, and the tin-plated steel sheets were prepared by the following sequence of steps (1)-(4): (1) using the above-mentioned Fe-Ni alloy plating condition 1 at 0.21 mm thick Carry out Fe-Ni alloy plating to have 15mg / m on the cold-rolled steel plate that has degreased and pickled 2 Ni; (2) use the above-mentioned Fe-Ni alloy plating condition 2 to carry out plating Fe-Ni alloy to have 10mg / m 2 of Ni; (3) Sn plating is carried out using the above Sn plating conditions to have 11.5 g / m 2 of Sn, followed by melt treatment; and (4) chemical treatment using the above chemical treatment conditions to form a chromium metal equivalent of 9 mg / m 2 chemical treatment layer.

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Abstract

A corrosion resistant surface-treated steel sheet suitable for an uncoated can accommodating an acidic food or beverage. The surface-treated steel sheet comprises: an alloy layer (1) on a surface of steel sheet (4) to be an inner wall of can (after being formed into can), wherein the alloy layer (1) contains, by mass %, Sn of 50-75%, Fe of 20-40% and Ni of 7-20%; an alloy layer (2) on the alloy layer (1), wherein the alloy layer (2) contains, by mass %, Sn of 70-80%, Fe of 15-25% and Ni of 0.1-7%; and an unalloyed Sn plating layer (3) of which coating weight is 1.5 - 15.0g / m<2> are formed in the named order; wherein a total amount of Sn per unit area in the alloy layers (1) and (2) is 0.2 - 2.0g / m<2> and a total amount of Ni per unit area in the alloy layers (1) and (2) is 0.001-0.3g / m<2>.

Description

[0001] This application claims priority from Japanese Application No. 2006-031911 filed in Japan on February 9, 2006, which is incorporated herein by reference in its entirety. technical field [0002] The present invention relates to a tin-plated steel sheet excellent in corrosion resistance, which is particularly suitable for uncoated cans containing acidic foods such as bamboo shoots, pineapples, cherries, and the like. Background technique [0003] For uncoated cans containing acidic food products, it has been desired to reduce as much as possible the amount of tin that elutes into the contents of the can. In the present invention, "corrosion" is defined as the elution of tin into the contents of the tank. Such as image 3 As shown, currently available tin-plated steel sheets are composed of steel sheet 4, alloy layer (FeSn 2 ) 1 and a tin layer 3, which is manufactured by electroplating tin on the steel sheet, followed by melting treatment. [0004] Conventionally, wi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25D5/14C25D5/50C25D11/38B32B15/00C23C22/24C23C28/00
CPCC25D11/38C25D5/505C23C28/023C23C28/021C25D3/60C25D5/14C23C2/08
Inventor 西田浩平野茂高宫利明油井聪杉山昌章
Owner NIPPON STEEL CORP
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