Composite steel sheet with excellent adhesion and method for manufacturing the same

Abstract

The present invention provides a composite steel sheet with excellent adhesion properties and a method for manufacturing the same. [Solution] A lightweight composite steel sheet is provided in which adhesion can be maximized by forming a microstructure on the surface and inside of a plated steel sheet and then bonding it with a plastic layer.

Claims

1. base iron and, A plating layer provided on at least one surface of the base iron, The plated layer includes a resin layer provided on the plated layer, The interface roughness Ra between the plating layer and the resin layer is 0.5 to 1.5 μm. The aforementioned plating layer has voids inside. A composite steel sheet having an average diameter of 10 nm to 3 μm for the voids within the aforementioned plating layer.

2. The voids located within the plating layer, closest to the base iron, are accessible from the surface of the aforementioned plating layer. The composite steel sheet according to claim 1, wherein the depth up to the end is 10 to 90% of the total thickness of the plating layer. 。

3. The cross-sectional area of ​​the aforementioned plating layer is 9 μm². ２ The number of voids with a diameter of 10 nm or more contained within The composite steel plate according to claim 1, wherein the number of pieces is 5 to 30.

4. The area fraction of voids with a diameter of 10 nm or more relative to the total cross-sectional area of ​​the aforementioned plating layer is 10 to 80 The composite steel sheet according to claim 1, wherein the percentage is %.

5. Of the total area of ​​voids within the plating layer, the area of ​​the voids occupied by the resin layer is The composite steel sheet according to claim 1, wherein the fraction is 20 to 90%.

6. A second plating layer provided on the resin layer, and a second base material provided on the second plating layer A composite steel sheet according to claim 1, further comprising iron.

7. The steps include: forming a plating layer on at least one surface of a base iron to obtain a plated steel sheet; The plated steel sheet contains one or more selected from the group consisting of HCl and NaCl. The first step involves using a secondary electrolyte to perform primary electrolytic etching, On the plated steel sheet that has undergone the primary electrolytic etching treatment, HNO ３ NaOH, H ３ PO ４ , H ２ SO ４ 、 Na ２ SO ４ and NaH ２ PO ４ containing one or more selected from the group consisting of The step involves performing a secondary electrolytic etching treatment using a secondary electrolyte, The steps include: heat-sealing a resin sheet onto the plated steel sheet that has undergone secondary electrolytic etching; A method for manufacturing composite steel sheets, including the method described above.

8. The above-mentioned primary electrolytic etching step is performed at a voltage of 1 to 10 V for 1 to 20 seconds. The above-mentioned secondary electrolytic etching process is performed at a voltage of 1 to 10 V for 1 second to 20 minutes. A method for manufacturing composite steel sheets as described in item 7.

9. The step of heat-sealing the resin sheet is performed at a temperature of 150 to 230°C, as described in claim 7. A method for manufacturing composite steel sheets.

10. The primary electrolyte is a concentration of one or more substances selected from the group consisting of HCl and NaCl. A method for manufacturing a composite steel sheet according to claim 7, wherein the degree is 0.1 to 1.5%.

11. The secondary electrolyte is HNO ３ NaOH, H ３ PO ４ , H ２ SO ４ Na ２ SO ４ and NaH ２ PO ４ The concentration of one or more substances selected from the group consisting of the above is 0.01 to 1.5 M. A method for manufacturing a composite steel sheet according to claim 7.

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