Abstract: The present invention relates to a composite steel sheet having excellent adhesiveness, and a manufacturing method therefor, and, more particularly, to a light composite steel sheet obtained by forming microstructures on the surface and inside of a plated steel sheet, and then bonding same with a plastic layer to maximize adhesiveness.

Abstract: The present invention provides a metal-plastic composite material having excellent adhesive strength and formability and a method for manufacturing the same, and specifically, the present invention provides a metal-plastic composite material and a method for manufacturing the same comprising: a metal layer; and a plastic layer on at least one surface of the metal layer, wherein a thin film layer formed of a silane coupling agent is provided between the metal layer and the plastic layer, and the metal layer and the plastic layer are bonded by covalent bonding with the silane coupling agent.

Abstract: The present invention pertains to a method for producing a graphene-coated steel sheet, the method comprising the steps of: modifying the surface of the steel sheet so that the surface is negatively charged; forming a positively-charged first graphene oxide layer on the surface-modified steel sheet; forming a negatively-charged second graphene oxide layer on the first graphene oxide layer; and heat-treating the steel sheet on which the first and second graphene oxide layers are formed. The present invention provides a graphene coating method which can be easily applied to large-area coating through a simple process without a special dispersant or binder, and has the effect of allowing the excellent physical properties of graphene to be more efficiently exhibited.

Abstract: Provided is a manufacturing method of a surface-treated Zn—Ni alloy electroplated steel sheet, the method comprising the steps of: preparing a Zn—Ni alloy electroplated steel sheet including a steel sheet and a Zn—Ni alloy-plated layer with an Ni content of 5-20 wt % (S1); preparing an alkaline electrolyte solution in which 4-250 g/L of potassium hydroxide (KOH) or sodium hydroxide (NaOH) or both combined are added in distilled water (S2); and inside the alkaline electrolyte solution, placing the Zn—Ni alloy electroplated steel sheet as an anode and installing another metal sheet as a cathode, and applying 2-10 V of an alternating or direct current to conductor electrochemical etching such that a 3-point average value of the arithmetic average roughness (Ra) of the surface of the Zn—Ni alloy electroplated steel sheet reaches 200-400 nm, thereby producing a surface-treated electroplated steel sheet (S3).

Abstract: Provided is a manufacturing method of a surface-treated Zn—Ni alloy electroplated steel sheet, the method comprising the steps of: preparing a Zn—Ni alloy electroplated steel sheet including a steel sheet and a Zn—Ni alloy-plated layer with an Ni content of 5-20 wt % (S1); preparing an alkaline electrolyte solution in which 4-250 g/L of potassium hydroxide (KOH) or sodium hydroxide (NaOH) or both combined are added in distilled water (S2); and inside the alkaline electrolyte solution, placing the Zn—Ni alloy electroplated steel sheet as an anode and installing another metal sheet as a cathode, and applying 2-10 V of an alternating or direct current to conductor electrochemical etching such that a 3-point average value of the arithmetic average roughness (Ra) of the surface of the Zn—Ni alloy electroplated steel sheet reaches 200-400 nm, thereby producing a surface-treated electroplated steel sheet (S3).

Abstract: The present invention relates to a solar cell substrate, and to a solar cell using same. The solar cell according to one embodiment of the present invention comprises: a lower substrate; and a lower electrode formed on the lower substrate. The lower electrode is formed of a Mo—X—Na three-component-system compound metal layer. Here, X may be one of Nb, Ni, Si, Ti, W, and Cr. The solar cell according to another embodiment of the present invention may comprise: a solar cell substrate including a lower substrate and a Mo—X—Na three-component-system compound metal layer that is a lower electrode formed on the lower substrate; a light-absorption layer formed on the solar cell substrate; a buffer layer formed on the light-absorption layer; a transparent window formed on the buffer layer; and an upper electrode formed on the transparent window.

Abstract: One aspect of the present invention is a solar cell substrate, comprising: a lower substrate; and a lower electrode that is formed on the upper part of said lower substrate, wherein a metal diffusion-preventing film having at least one or two or more metal layers is included between said lower substrate and said lower electrode, and if two or more metal layers are formed, the metal layers adjoining each other can be different metals.

Abstract: A resin composition for a pre-coated steel sheet having excellent welding properties, corrosion resistance and workability, a method of producing a pre-coated steel sheet using the same, and a pre-coated steel sheet are provided. More particularly, a metal resin composition for coating a film is provided. The composition includes a subject resin, a curing agent, and at least one kind of metal powder selected from the group consisting of Ni, Co, Mn, Fe, Ti, Cu, Al, Zn, Sn and Fe2P powder, and has an average short-axis diameter (?) satisfying the condition t/3???3t (where t is a thickness of a dried coating film formed by coating a resin metal composition for coating the coating film). Therefore, the steel sheet to which the metal resin composition is coated has excellent welding properties, corrosion resistance and workability.