High-temperature oxidation resistant plating layer material and hot dipping method for hot stamping formed steel

Abstract

The invention discloses a high-temperature oxidation resistant plating layer material and a hot dipping method for hot stamping formed steel. A hot stamping formed steel plate enters a plating solution for hot dipping and then is subjected to cooling and heat treatment so that a hot dipping steel plate can be obtained, wherein the plating solution comprises the following components in percentage by mass: 1.0%-15.0% of Si, 0.5%-10.0% of Cu, 0.1%-1.0% of Cr, less than or equal to 1.0% of Fe and the balance of Al and inevitable impurities. According to the method, the Cu element and Al element which are contained in a plating layer form a high-melting point intermetallic compound in a cooling process after the hot dipping, and Cr is gathered on the surface of the plating layer to form a compact oxidation film, so that the high-temperature oxidation resistant property of the plating layer is greatly enhanced; the Cu element is enriched on the surface of the plating layer, so that the corrosion-resisting property of the plating layer is greatly enhanced. The high-temperature oxidation resistance and the high-temperature corrosion resistance of the plating layer are enhanced by utilizing the intermetallic compounds formed among Al, Si, Cr, Cu and Fe; and the obtained plating layer has the advantages of reasonability in structure, tight combination with a substrate and good high-temperature oxidation resistance and corrosion-resisting property.

Description

technical field [0001] The invention belongs to the surface protection technology of iron and steel materials, in particular to a high-temperature oxidation-resistant coating material and a hot-dip coating method for hot stamping formed steel. Background technique [0002] Hot stamping forming steel is an ultra-high strength steel with a tensile strength exceeding 1500Mpa. It is directly processed and formed by hot stamping. It is mainly used in the production of high-strength and difficult-to-form parts of automobiles. It can avoid cold forming that is difficult to form, large springback, Disadvantages such as poor part size and shape stability. However, the working conditions of the steel plate are harsh during heating or hot forming. It is easy to produce iron oxide scale during heating, and it is easy to damage the mold when the iron oxide scale is cold during stamping. Productivity. Therefore, it is necessary to protect the surface of hot-formed steel with a coating t...

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Problems solved by technology

[0003] At present, there are mainly the following production methods for hot stamping steel surface coating materials: 1. Production by thermal spraying, grinding mineral raw materials, metal oxides, metal nanoparticles, borides and graphite into powder, and then mixing with Water is mixed into a slurry, coated on the surface of the pretreated steel plate, and cured at a certain temperature to form a high-temperature oxidation-resistant coating; the coating obtained by this method has the advantage of resisting high temperatures around 1000 ° C, and the disadvantage is that the coating has The element distribution and structure are not uniform, and the surface roughness is high, so it is not suitable for coating of hot stamping steel

2. Electroplating is used for production. This method has the disadvantages of high production cost of the coating and the waste liquid is easy to pollute the environment.

However, this coating material needs to add expensive rare earth elements lanthanum (La) and cerium (Ce), which has the disadvantage of high cost

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