Anti-high temperature oxidation coating material and hot-dip coating method for hot stamping steel

Abstract

The invention discloses a high-temperature oxidation-resistant coating material for hot stamping formed steel and a hot-dip coating method. The hot-dip steel plate can be obtained by cooling and heat-treating the hot-stamped steel plate after entering the plating solution for hot-dip coating ; The mass percent content of the plating solution components is: Si 1.0-15.0%, Cu 0.5-10.0%, Cr 0.1-1.0%, Fe≤1.0%, and the rest are Al and unavoidable impurities. Cu element and Al element in this coating form intermetallic compounds with high melting point during the cooling process after plating, and Cr gathers on the surface of the coating to form a dense oxide film, thereby greatly improving the high temperature oxidation resistance of the coating; Cu element in the coating The surface enrichment greatly improves the corrosion resistance of the coating. The coating utilizes the intermetallic compounds formed between Al, Si, Cr, Cu, and Fe to improve the high temperature oxidation resistance and high temperature corrosion resistance of the coating; the obtained coating has a reasonable structure and is tightly combined with the substrate, with good high temperature oxidation resistance performance and corrosion resistance.

Description

Technical field [0001] The invention belongs to the surface protection technology of steel materials, in particular to a high temperature oxidation resistant coating material and a hot dip coating method for hot stamping forming steel. Background technique [0002] Hot stamping forming steel belongs to ultra-high-strength steel with a tensile strength of more than 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 difficult to form, large springback, Disadvantages such as poor part size and shape stability. However, the working conditions of the steel plate during heating or hot forming are harsh, and iron scale is easily generated during heating. The iron scale will easily damage the mold when it is cold during stamping. At the same time, the unshed iron scale needs to be removed by shot blasting, which increases equipment maintenance costs and af...

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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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