Treatment process for improving high-temperature, salt and corrosion resisting performance of hot spraying coating

Abstract

The invention discloses a treatment process for improving high-temperature, salt and corrosion resisting performance of hot spraying coating. Strong impulse electron beam is used for re-melting treatment to the surface of hot spraying coating, so as to produce a surface modified organization with even surfaces and a dense structure, prevent the high-temperature corrosion medium from immersing into gaps of the coating and corroding basis material, and improve the high-temperature, salt and corrosion resisting performance of hot spraying coating. The invention has the following positive results: the strong impulse electron beam is high in high energy density and is suitable for surface re-melting treatment to all alloys and ceramic coatings, and meanwhile is high in energy conversion rate; surface irradiation treatment to surfaces by the strong impulse electron beam is performed under a vacuum environment, erosion and element pollution to surfaces of workpieces can be avoided, the problem of emission to environment is avoided, and meanwhile, the treatment process has the advantages that the operation is simple, the energy control accuracy is high, and the quality is stable, and the degree of automation is high.

Description

technical field [0001] The invention belongs to the technical field of material surface modification, and relates to a treatment method for improving the high-temperature salt corrosion resistance of a thermal spray coating. Background technique [0002] Thermal spraying technology is a method of coating preparation, one of surface protection and strengthening technologies, and plays an important role in surface engineering. There are various methods of thermal spraying, many types of spraying materials, and a wide range. It can prepare coatings on the surface of various materials (including metals, ceramics, glass, plastics, wood, and even cloth and paper), and there is no special requirement for the size of the workpiece. The temperature of the workpiece Below 200 ℃, it is not easy to deform, so it has been applied in aerospace, mechanical metallurgy, coal power, chemical petroleum, weapons, and even food and textile fields, with significant economic and social benefits. ...

AI Technical Summary

Problems solved by technology

However, since the laser processing process is carried out under atmospheric conditions, auxiliary gas must be used to isolate the air at this time, otherwise oxidation and ablation will occur on the surface of the workpiece

In addition, the energy penetration depth of the laser is small, coupled with the reflection of the incident laser on the treated surface, the overall energy conversion efficiency of the laser is low

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