Anti-high temperature oxidation coating material and hot dipping process for hot stamping steel

Abstract

The invention discloses a high-temperature-oxidization-resistant coating material for hot-stamped formed steel and a hot-dipping plating technology. A plating solution comprises the following components in percentage by mass: 5.0-20.0% of Si, 0.5-10.0% of Ni, 0.1-12.0% of Ce, 0.1-2.0% of La, not more than 1.0% of Fe, and the balance of Al and inevitable impurities. According to the coating material, the grain size of the texture can be effectively refined by adding rare earth and other elements in the plating solution; the coating is an Al-Si-Ni-rare earth material, Al and Si elements are main components of the coating and are combined with ferrum to generate a ferro-silicon-aluminum phase and further improve the oxidization resistance capability, the melting point of aluminum silicon can be further improved by Ni, and the grain size of the coating can be refined through the rare earth elements; therefore, the coating has the characteristics that the high-temperature oxidization resistance performance is excellent, the surface is difficult to crack after hot-stamped forming, and the coating is not adhered to a mold. Elements in the coating obtained by adopting the technology are uniformly distributed and organized with high density, are closely combined with a substrate, thus having high high-temperature oxidization resistance performance; during heating process, the high-temperature-oxidization-resistant coating material does not stick a furnace bottom roll, a steel substrate and a stamping mold can be better protected.

Description

technical field [0001] The invention relates to a coating material and a dipping process, in particular to a high temperature oxidation resistant coating material for hot stamping steel and a hot dipping process. 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 that is resistant to high-temper...

AI Technical Summary

Problems solved by technology

The coating obtained by the first method has the advantage of being resistant to high temperatures of about 1000°C. The disadvantage is that the distribution and structure of elements in the coating are not uniform, and the surface roughness is high, so it is not suitable for coating of hot stamping formed steel.

The production cost of the plating layer produced by electroplating is high, and the waste liquid is easy to pollute the environment

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