Composite high-energy beam pretreatment method for repairing thermal spraying metal coating

By employing a composite high-energy beam pretreatment method, which combines continuous lasers and nanosecond lasers, the problems of removing damaged areas and activating the substrate in thermally sprayed nickel-based coatings have been solved, achieving an efficient and environmentally friendly coating repair process.

CN120839281AActive Publication Date: 2025-10-28NORTHEASTERN UNIV CHINA
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Patent Information

Application Number
CN202511315818.7
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2025-09-16
Publication Date
2025-10-28
Estimated Expiration
2045-09-16

AI Technical Summary

Technical Problem

Existing technologies are insufficient for efficiently and environmentally friendly removal of damaged areas from thermally sprayed nickel-based coatings, while simultaneously activating the substrate surface. Traditional sandblasting processes present challenges in dust pollution and controlling substrate surface roughness.

Method used

A composite high-energy beam pretreatment method is adopted, which combines a continuous laser and a nanosecond laser. By precisely controlling parameters such as laser power and pulse frequency, the energy input is dynamically adjusted to achieve precise removal of metal coatings and activation of the substrate.

Benefits of technology

It achieves efficient and pollution-free coating removal and substrate activation, ensuring that the surface condition is suitable for recoating, improving construction efficiency, reducing costs, and meeting environmental protection requirements.

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Abstract

A composite high-energy beam pretreatment method for repairing a thermal spraying metal coating belongs to the technical field of material science and processing, and comprises the following steps: acquiring a coating material, shape and thickness of a damaged area of a metal coating of a workpiece to be treated, adjusting working parameters of a continuous laser, cleaning the damaged area of the metal coating, and carrying out thermal spraying on the damaged area of the metal coating; removing the damaged coating; and according to the continuous laser cleaning result, working parameters of the nanosecond laser are adjusted, the nanosecond laser is adopted to remove the residual damaged coating, and after laser treatment is finished and cleaning is conducted, the treated workpiece is obtained. According to the method, laser is adopted as a pretreatment means, micron-level precision selective removal of the metal coating is achieved, the method is particularly suitable for local repair of high-bonding-strength materials such as nickel-based coatings, and peripheral intact coatings and base materials can be completely reserved; dust and chemical waste are hardly generated in the treatment process, and an active oxide layer beneficial to combination of a new coating can be induced to be generated on the surface through parameter optimization.
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