Method for preparing aluminum-based amorphous layer by jointly adopting hot spraying and electron beam remelting technologies

Abstract

The invention discloses a method for preparing an aluminum-based amorphous layer by jointly adopting hot spraying and electron beam remelting technologies, and relates to the technical field of preparation of an aluminum-based amorphous coating. The method comprises the steps of preparing an Al-Co-Ce alloy, carrying out a gas atomization process on the alloy so as to powder, then utilizing a supersonic speed flame for hot-spraying a substrate surface so as to prepare an Al-Co-Ce alloy protection coating, and finally adopting a high-current pulse electron-beam for carrying out surface modification on the prepared Al-Co-Ce alloy protection coating, wherein the Al-Co-Ce alloy is prepared from 4.0 to 8.0 at percent of Co, 6.0 to 8.0 at percent of Ce and the balance Al. According to the methodfor preparing the aluminum-based amorphous layer by jointly adopting the hot spraying and electron beam remelting technologies provided by the invention, surface modification is carried out on the surface of a hot-spraying coating, so that the amorphous alloy layer with a flat surface and a compact structure is generated, and the corrosion resistance of the hot-spraying coating is improved.

Description

technical field [0001] The invention relates to the technical field of preparation of aluminum-based amorphous coatings, in particular to a method for preparing aluminum-based amorphous layers using thermal spraying and electron beam remelting composite technology, and is especially suitable for coating protection of metal substrates in marine and other environments . Background technique [0002] Amorphous alloys have been proven to have better corrosion resistance than crystalline phase materials with the same composition. Among them, aluminum-based amorphous alloys have attracted the attention of a large number of researchers due to their low price, high specific strength, and good plasticity. A large number of studies have shown that the amorphous alloy coating prepared by thermal spraying technology has better corrosion protection performance than the traditional aluminum clad layer, and this technology can also be applied to on-site repair. [0003] For example, the a...

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Problems solved by technology

[0005] The above-mentioned prior art all discloses thermal spraying technology, however, no matter what kind of thermal spraying technology adopts at present, all comprises a certain amount of crystal phase, oxide phase, typical lamellar and pore structure in the coating, this greatly limits Corrosion resistance of the coating

In addition, due to the limitation of the cooling rate of the coating material in the thermal spraying process and the microstructure of the thermal sprayed coating itself, the thermal spraying technology cannot prepare a coating with a completely amorphous composition.

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