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Zinc phosphate treated galvanized steel sheet and manufacturing method thereof

A technology of galvanized steel sheet and manufacturing method, applied in hot-dip plating process, superimposed layer plating, coating, etc., can solve problems such as uneven appearance, achieve no uneven appearance, excellent press formability, and stable manufacturing. Effect

Active Publication Date: 2020-11-10
JFE STEEL CORP
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0011] Therefore, it is an object of the present invention to solve the above-mentioned problems in the prior art, and to provide suitable restraint even when it is used in automotive parts, etc., in which the integration of parts and the complexity of shape have been developed in recent years. Zinc phosphate-treated galvanized steel sheet that has excellent press formability due to mold scratches caused by cracking of molded products during press molding, has no uneven appearance, paint adhesion, and post-paint corrosion resistance

Method used

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  • Zinc phosphate treated galvanized steel sheet and manufacturing method thereof
  • Zinc phosphate treated galvanized steel sheet and manufacturing method thereof
  • Zinc phosphate treated galvanized steel sheet and manufacturing method thereof

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Embodiment

[0049] Steel sheets with a thickness of 0.7 mm that have been annealed after cold rolling are electrogalvanized by a common method, and then dipped in a surface conditioning treatment solution of 3.0 g / L at 40°C ("PL- ZN") for 3 seconds, thereby implementing a surface conditioning treatment. Next, the zinc phosphate treatment solution having the composition shown in Table 1 was blown onto the galvanized steel sheet from the slit nozzle at the predetermined blowing angle shown in Table 2, thereby forming a zinc phosphate-based film.

[0050] It should be noted that the slit nozzle is Figure 4 The configuration of the slit nozzle is set as the blowing conditions of zinc phosphate treatment liquid sprayed by the slit nozzle. , The injection pressure is set to 0.5kgf / cm 2 .

[0051] [Table 1]

[0052] PO 4 (g / L)

15.7 Zn(g / L) 1.4 Ni(g / L) 0.5～1.3 Mn(g / L) 0.5～3.5 NO 3 (g / L)

2.5

[0053] For the obtained zinc phosphate-treated galva...

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Abstract

The present invention provides a zinc phosphate-treated zinc-plated steel plate having an excellent press moldability, with which mold galling which leads to breakage of the molded article at the time of press molding can be adequately restricted, even when used as automobile parts, which have been seeing moves towards parts integration and more complicated shapes in recent years. Provided is a zinc-plated steel plate having, on at least one side thereof, a zinc phosphate coating film, wherein the zinc phosphate coating film has a deposited amount of 1.0-2.0 g / m2, a Mn content of 3.0-8.0 mass%, and a Ni content of 0.7-1.3 mass%, and the coating film surface has a three-dimensional arithmetic average roughness Sa of 0.05-0.12 µm and a three-dimensional maximum height of surface irregularities Sz of 0.4-0.9 µm. The zinc phosphate-treated zinc-plated steel plate has an enhanced press moldability due to improvement in sliding properties and mold galling resistance, has no unevenness in appearance, and also has excellent coating adhesiveness and post-coating corrosion resistance.

Description

technical field [0001] The present invention relates to a zinc phosphate-treated galvanized steel sheet that has low sliding resistance during press forming, has excellent press formability, has no uneven appearance, and is excellent in paint adhesion and corrosion resistance after painting, and a method for producing the same. Background technique [0002] Electrogalvanized steel sheets are widely used in a wide range of fields, mainly for automobile bodies, and they are used by press molding in these applications. However, electrogalvanized steel sheets have a disadvantage of poor press formability compared to cold-rolled steel sheets. The reason for this is that the sliding resistance of the electrogalvanized steel sheet in the pressing die is higher than that of the cold-rolled steel sheet. That is, there is a problem that the galvanized steel sheet is less likely to flow into the pressing die at portions where the sliding resistance between the pressing die and the bea...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C22/18C23C2/06C23C2/40C23C22/76
CPCC23C2/06C23C2/40C23C22/18C23C22/76C23C22/12C23C22/184C23C28/321C23C28/3225C23C28/34
Inventor 星野克弥荒川真吾今井克德今村真人古谷真一松田武士土本和明松崎晃
Owner JFE STEEL CORP
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