A high-energy short-pulse laser processing method for removing stealth coatings on metal surfaces

Abstract

The invention belongs to the laser processing technology, and relates to a high-energy short-pulse laser processing method of removing an invisible coating on a metal surface. The method comprises thesteps that a film which is matched with the wavelength of used lasers covers the surface of the invisible coating, and is irradiated by high-energy short-pulse lasers, laser scanning treatment is conducted on the surface of the invisible coating by means of control over laser parameters, the overlapping ratio and a scanning path, then the film is removed, and the invisible coating is rapidly peeled off and removed from the surface of a metal component. The high-energy short-pulse laser processing method of removing the invisible coating on the metal surface is used for meeting the requirementfor removing the invisible coating on the surface of an aluminum alloy part or a titanium alloy part or a steel part, can remove the large-area coating, has a few influence on a metal matrix, and hasthe advantages of being high in accuracy, good in controllability, green, environmentally friendly, fast, efficient and high in applicability. The technology can also be applied to the fields of moldprocessing, vehicle maintenance and repair, coating production and the like, and is broad in prospect.

Description

technical field [0001] The invention belongs to laser processing technology, and relates to a high-energy short-pulse laser processing method for removing a stealth coating on a metal surface. Background technique [0002] The surface of high-performance advanced aircraft is usually covered with a thick stealth coating, which is an organic coating modified by adding inorganic substances, which is opaque and has a thickness of more than 0.1mm. It has the functions of absorbing waves and reducing infrared radiation. It can reduce the chance of the aircraft being detected by radar and infrared trackers. Since the coating is applied on the outer surface of the aircraft and is scoured by high-speed airflow, it is required that the coating has a high bonding force with the surface of the aircraft's metal components. At the same time, due to factors such as airflow erosion and foreign object impact, the coating will fail after a period of service, and it should be repaired or repl...

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Problems solved by technology

[0003] At present, there are generally two methods to remove this stealth coating: one is to use artificial sandpaper to remove the method. This method has the advantages of simple operation and wide applicability, but the labor cost is large, and there are uncontrollable processes. The shortcomings such as easy damage to the metal surface are not suitable for the removal of large-area coatings on the outer surface of the aircraft; the other is the laser ablation removal method, which can accurately remove the coating, but it will generate open flames and a lot of smoke at the operation site , there is a risk of fire, and the environment is polluted

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