Cold-spraying and micro-arc oxidation combined workpiece surface treatment method

Abstract

The invention provides a cold-spraying and micro-arc oxidation combined workpiece surface treatment method. The method comprises the following steps that S1, oil stains on the surface of a workpiece are removed, and the surface of the workpiece is subjected to sand blasting; S2, the surface, subjected to sand blasting, of the workpiece is subjected to cold spraying, and a cold-spraying metal coating is formed on the surface of the workpiece; S3, the surface, subjected to cold spraying, of the workpiece is subjected to polishing treatment; S4, the workpiece subjected to cold spraying and polishing treatment is subjected to micro-arc oxidation, and a micro-arc oxidation metal ceramic layer is formed on the surface of the workpiece; and S5, the surface, coated with the micro-arc oxidation metal ceramic layer, of the workpiece is subjected to polishing after-treatment. The surface corrosion-resistant wear-resistant treatment method combining cold spraying and micro-arc oxidation technologies can be applied to surface corrosion resistance and repair remanufacturing of workpieces made of any material; and compared with an existing process, the wear-resistant and corrosion-resistant strengthening properties are improved, and meanwhile applicability, economical efficiency and environmental conservation are all considered, so that great market promotion value is achieved.

Description

technical field [0001] The invention relates to surface treatment technology, in particular to a corrosion-resistant treatment method for a workpiece surface, in particular to a corrosion-resistant and wear-resistant treatment method for a workpiece surface combining cold spraying and micro-arc oxidation. Background technique [0002] Micro-arc oxidation technology is a surface treatment technology developed in recent years. Micro-arc oxidation technology can be used to prepare a cermet layer on the surface of the workpiece, so that the surface of the workpiece will greatly improve the anti-corrosion and wear resistance of the workpiece. However, due to the micro-arc oxidation Due to the limitations of the technology itself, it can only be used for surface modification of light metals, such as aluminum, magnesium, titanium and other metal workpieces, which greatly limits the application industry and scope of this technology. At the same time, due to the limited thickness of ...

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Problems solved by technology

[0003] The invention proposes a corrosion-resistant and wear-resistant treatment method for the surface of workpieces combining cold spraying and micro-arc oxidation, which innovatively combines cold spraying and micro-arc oxidation technology, and is the first to use cold spraying technology before the workpiece is subjected to micro-arc oxidation The corrosion-resistant aluminum metal coating is prepared on the surface of the workpiece. After optimizing the parameters of the cold spraying process, especially the optimization of the air pressure, gas temperature, powder feeding voltage, spraying speed and distance, the coating is firmly bonded to the substrate, has a dense structure and is relatively thick. Thick metal coating, and then further in order to overcome the performance shortcomings of insufficient corrosion resistance and wear resistance on the surface of the workpiece, and then choose to use micro-arc oxidation technology to self-grow alumina cermet on the aluminum metal coating on the surface of the workpiece, and the final product The composite coating has high corrosion resistance and high wear resistance, which is a great improvement to the corrosion resistance and wear resistance of the surface of common material workpieces and remanufacturing technology, which greatly expands the application range of micro-arc oxidation technology. The spraying technology can spray a large thickness, making the micro-arc oxidation technology not only suitable for surface modification, but also for the repair and remanufacturing of damaged workpieces