Abstract: Provided is an organic-inorganic composite resin composition for coating the surface of a zinc-plated steel sheet, comprising 5-25 wt % of a polymer resin, 4-20 wt % of a silane compound, 3-10 wt % of a curing agent and 0.1-2 wt % of ferrocene compound on the basis of the total weight of the composition.

Abstract: The present invention relates to a resin composition comprising 40% to 50% by weight of a polyester resin on the basis of a total of 100% by weight of the composition, the polyester resin comprising a main resin and an auxiliary resin, wherein the main resin has a higher molecular weight than the auxiliary resin, and the difference of a glass transition temperature between the main resin and the auxiliary resin is 25° C. or less.

Abstract: Provided is a Zn—Ni electroplated steel sheet having excellent corrosion resistance and formability and a manufacturing method therefor. The steel sheet includes: abase steel sheet; and a Zn—Ni plated layer formed on the base steel sheet, wherein a Ni alloying degree within the Zn—Ni plated layer is 7.5-14%, and the Ni amount is 40-50 atom % in a region within 1 pm toward the Zn—Ni plated layer from an interface of the base steel sheet and the Zn—Ni plated layer. Provided is a Zn—Ni electroplated steel sheet, which has superior corrosion resistance and formability despite having a relatively low nickel alloying degree, has excellent price competitiveness compared with that of a conventional Zn—Ni plated steel sheet and two-layer plated steel sheet, and can ensure high productivity.

Abstract: The present invention relates to a resin composition comprising 40% to 50% by weight of a polyester resin on the basis of a total of 100% by weight of the composition, the polyester resin comprising a main resin and an auxiliary resin, wherein the main resin has a higher molecular weight than the auxiliary resin, and the difference of a glass transition temperature between the main resin and the auxiliary resin is 25° C. or less.