Posco

Posco Co., Ltd

Chang-Se Byeon

Jung-Su Kim

Hye-Jin Yoo

Je-Hoon Baek

Hye Jin Yoo

Yong-Gyun Jung

Kang-Min Lee

Jong Sang Kim

Kangmin Lee

Jehoon Baek

Hwi-Geon Kim

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.

Graphene-coated steel sheet and method for producing same

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.

Metal-plastic composite material and method for manufacturing same

A composite material comprising a plastic layer; and a steel sheet laminated on one side or both sides of the plastic layer, and having a structure in which plastic particles are introduced onto the surface of the side where the plastic layer is laminated with the steel sheet and a method for producing the same are provided, wherein the composite material is capable of being used as automotive parts or structures, and the like.

Composite material in which steel sheet and plastic layer having functional group introduced therein are laminated, and method for producing same

Provided is a manufacturing method of a surface-treated Zn&#x2014;Ni alloy electroplated steel sheet, the method comprising the steps of: preparing a Zn&#x2014;Ni alloy electroplated steel sheet including a steel sheet and a Zn&#x2014;Ni alloy-plated layer with an Ni content of 5-20 wt % (S); 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 (S); and inside the alkaline electrolyte solution, placing the Zn&#x2014;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&#x2014;Ni alloy electroplated steel sheet reaches 200-400 nm, thereby producing a surface-treated electroplated steel sheet (S).

Manufacturing method of surface-treated zinc-nickel alloy electroplated steel sheet having excellent corrosion resistivity and paintability

According to the present invention, a noncovalent bond-modified carbon structure has advantages of: enabling the control of properties by controlling intervals between carbon structures according to the size and structure of a compound represented by Chemical Formula 1, which is inserted and adsorbed between the carbon structures; and enabling uniform dispersion in a polymer matrix without a change in intrinsic properties. In addition, a carbon structure/polymer composite comprising the modified carbon structure and a polymer matrix is simply manufactured and readily layered due to excellent orientation when forming a cured coating film, and thus can be useful for manufacturing a steel sheet having remarkable heat radiation, surface polarity, electrical properties and the like.

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Gwangyang-si, South Korea

Chang-Se Byeon