Lubricated hot-dip galvanized steel sheet with excellent viscidity and manufacturing method thereof

Abstract

The invention discloses a lubricated hot-dip galvanized steel sheet with excellent viscidity and a manufacturing method thereof. The hot-dip galvanized steel sheet comprises a cold rolled steel sheet,and a hot-dip galvanized coating, a compound composite layer and an anti-rust oil film which are arranged on the surface of the cold roller steel sheet in sequence from bottom to top, wherein the hot-dip galvanized coating is prepared from the following components in percentage by mass: 0.1 to 0.4 percent of Al and the balance of Zn and unavoidable impurities. The hot-dip galvanized coating has the roughness value of 0.6 to 1.5 mu m. The compound composite layer mainly comprises one or two salts of zinc acetate and zinc oxadiate; the mass per unit area of the compound composite layer is 8 to170mg / m<2>; the weight of the anti-rust oil film is 0.1 to 3 g / m<2>. The cold rolled steel sheet is IF steel for stamping. According to the lubricated hot-dip galvanized steel sheet with excellent viscidity and the manufacturing method thereof, the hot-dip galvanized steel sheet has original performance of the steel sheet used for an automobile body, and also has good machining formability (good surface lubricity and stamping stability), and moreover, has excellent viscidity to the adhesive used for an automobile.

Description

technical field [0001] The invention relates to a hot-dip galvanized steel sheet, in particular to a lubricated hot-dip galvanized steel sheet with excellent adhesiveness and a manufacturing method thereof. Background technique [0002] Hot-dip galvanized steel sheet (GI steel sheet) has excellent corrosion resistance and surface quality, as well as good weldability and paintability, and is widely used in various medium and high-end car body panels. However, the hardness of the coating on the galvanized steel sheet is low. During stamping and forming, scratches on the coating surface, peeling of the zinc layer, and zinc sticking to the die are prone to occur, resulting in poor stamping stability and even stamping cracks. Users reported that when GI steel plates are stamping parts with complex deformations such as automobile door inner panels, trunk inner panels, and side wall outer panels, problems of large stamping fluctuations and stamping cracks often occur. In addition,...

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Problems solved by technology

[0006] In order to overcome the problem of poor adaptability of automotive adhesives in the prior art, the object of the present invention is to provide a lubricated hot-dip galvanized steel sheet with excellent adhesiveness and a manufacturing method thereof, so that the hot-dip galvanized steel sheet can be kept as In addition to the original performance of the steel plate for automobile body, it also has good processing and forming performance (good surface lubricity and stamping stability), and has excellent adaptability to adhesives for automobiles

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