A carbon steel normal temperature blackening film composite corrosion prevention method based on nanosecond laser remelting

By adding cerium nitrate to the room-temperature blackening solution and subjecting it to ultrasonic treatment, combined with nanosecond laser beam scanning, a uniform and dense cerium element blackening film is generated, solving the problems of density and weak adhesion of the room-temperature blackening film and significantly improving the corrosion resistance of carbon steel.

CN122303866APending Publication Date: 2026-06-30JIANGSU UNIV
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
JIANGSU UNIV
Filing Date
2026-04-09
Publication Date
2026-06-30

AI Technical Summary

Technical Problem

Existing room-temperature blackening films have poor density, weak film-substrate adhesion, and are easily corroded by corrosive media. Furthermore, nanosecond laser remelting is prone to producing local defects, making it difficult to obtain a uniform and structurally complete protective layer.

Method used

Cerium nitrate is added to the blackening solution at room temperature and subjected to ultrasonic oscillation to generate a diffusely distributed cerium blackening film. Then, laser modification is performed by scanning with a nanosecond laser beam in a bow shape. Combined with the heterogeneous nucleation and surface activity of rare earth elements, the film is made uniform, dense, and strengthened.

Benefits of technology

It significantly improves the density and adhesion of the film, hinders the penetration of corrosive media, and enhances the overall corrosion resistance of carbon steel.

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Abstract

This invention discloses a composite anti-corrosion method for carbon steel based on nanosecond laser remelting using a room-temperature blackening film, belonging to the field of metal surface modification technology. Addressing the problems of loose structure, poor adhesion, and insufficient corrosion resistance caused by the physical deposition of traditional room-temperature blackening films, this invention involves in-situ deposition of a rare-earth modified room-temperature blackening film on the carbon steel substrate surface using an ultrasonic oscillation treatment in a room-temperature blackening solution containing cerium nitrate. The blackened film layer is then obtained by scanning the film layer line by line using a nanosecond pulsed laser beam with a predetermined overlap ratio in a zigzag path. Through the heterogeneous nucleation and surface tension reduction effects of rare-earth elements, combined with the rapid melting and molten pool mixing effect of nanosecond lasers, not only is the uniform densification of the blackened film's microstructure achieved, but the diffusion of iron elements in the substrate is also promoted to form a strong bonding interface. This invention effectively eliminates micropores and microcracks in the film layer, significantly improving the adhesion of the carbon steel surface and its overall corrosion resistance in complex environments.
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