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Surface-treated steel sheet

a technology of surface-treated steel and steel sheets, applied in the direction of coatings, electrolytic coatings, electrolytic inorganic material coatings, etc., can solve the problems of insufficient effect of coating film formation, workability or weldability degradation, and increase manufacturing costs, and achieve excellent barrier properties and excellent coating film adhesion

Inactive Publication Date: 2018-04-12
NIPPON STEEL CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The invention provides a treated steel sheet with good protection against oxygen and other gases, along with strong attachment between the protective layer and the underlying metal.

Problems solved by technology

The technical problem addressed in this patent relates to finding ways to improve the barrier properties of electrogalvanized steel sheets while reducing manufacturing costs and maintaining good workability/weldability. Additionally, it seeks to enhance the adhesion between plating layers and coatings applied onto the surface of these sheets. Various methods involving the use of Vanadium elements added to galvanized layers have been explored over the past few decades to address this issue.

Method used

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Examples

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Effect test

example 1

[0203]“Test Results of Vanadium-Containing Surface-Treated Steel Sheet”

[0204]A surface-treated steel sheet having plating layers including vanadium on both surfaces of a steel sheet was produced using the plating apparatus shown in FIG. 3 and a method described below and was evaluated.

[0205]A plating bath in a fluid state was prepared by circulating a plating bath having a plating bath composition, a temperature, and a pH shown in Table 1 at a relative average flow rate of 100 m / min.

TABLE 1Plating bath composition (mol / l)Plating bathV(V4+) +temperaturePlatingZn2+(VO2−)Na+Ni2−(° C.)bath pHBath (Zn—V)1.00.81.30.1502.2Bath (Zn)1.0———501.0

[0206]As the steel sheet, a 0.5 mm-thick SPCD steel sheet which is a drawing quality cold-rolled steel sheet defined by JIS G 3141 was used.

[0207]A pretreatment (nickel plating) was carried out on the steel sheet, and the steel sheet was used as a negative electrode.

[0208]In the pretreatment, first, as a plating bath for the nickel plating, ion exchang...

example 2

[0256]“Test Results of Film-Forming Vanadium-Containing Surface-Treated Steel Sheet”

[0257]A coating composition for forming films was prepared by stirring and dispersing the organic resin (R), the phosphoric acid compound (P), the carbon black (C), the organic silicon compound (W), the fluoro metal complex compound (F), the isocyanate compound (I), and the polyethylene wax (Q) shown in Table 8 in water which was a solvent at amounts (% by mass of the solid contents) shown in Table 9 and Table 10 using a coating disperser.

TABLE 8ReferenceKindSymbolNames of compounds and the likeOrganic resinRPolyurethane resin (SUPERFLEX620 manufactured by DKS Co., Ltd.)Phosphoric acid compoundP1Phosphoric acidP2Ammonium dihydrogen phosphateCarbon blackCEMF BLACK HK-3 manufactured by Toyocolor Co., Ltd.Organic silicon compoundW13-AminopropyltriethoxysilaneW23-GlycidoxypropyltrimethoxysilaneFluoro metal complex compoundFHexafluorotitanic acidIsocyanate compoundIBlocked isocyanate (Aqua BI220 manufactu...

example 3

[0313]“Test Results of Zirconium-Containing Surface-Treated Steel Sheet”

[0314]A surface-treated steel sheet having plating layers including zirconium on both surfaces of a steel sheet was produced using the plating apparatus shown in FIG. 2 and a method described below and was evaluated.

[0315]Meanwhile, the same facts as in Example 1 will not be described.

[0316]A plating bath in a fluid state was prepared by circulating a plating bath having a plating bath composition, a temperature, and a pH shown in Table 13 at a relative average flow rate of 100 m / min.

TABLE 13Plating bath composition (mol / l)Plating bathZr(Zr4+) +temperaturePlatingZn2+(ZrO2+)Na+Ni2−(° C.)bath pHBath (Zn—Zr)1.00.51.30.1501.5Bath (Zn)1.0———501.0

[0317]In addition, a pretreatment (nickel plating) was carried out using the steel sheet as a negative electrode. In the base-material-forming process and the upper layer plating process, the electric conduction times were set to times shown in Table 14 and Table 15, the curr...

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Abstract

A surface-treated steel sheet includes a steel sheet; and a plating layer which is formed on one surface or both surfaces of the steel sheet and which includes zinc and one of the group consisting of vanadium and zirconium, wherein the plating layer includes dendrite-shaped crystals including metallic zinc, and intercrystal filling regions which fill spaces between the dendrite-shaped crystals and show amorphous diffraction patterns when electron beam diffraction is carried out, wherein when the plating layer includes the vanadium, the intercrystal filling regions include a hydrated vanadium oxide or a vanadium hydroxide, and, wherein when the plating layer includes zirconium, the intercrystal filling regions include a hydrated zirconium oxide or a zirconium hydroxide.

Description

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Claims

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Application Information

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Owner NIPPON STEEL CORP
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