New Laser Anti-Corrosion Technologies-ShangHai RunQia Electronics Technology Co.,Ltd.

New Laser Anti-Corrosion Technologies

Laser Anti-Corrosion AlloyingLaser anti-corrosion alloying refers to coating a small amount of alloying elements on the surface of composite materials, followed by laser irradiation to melt both the substrate and the alloying elements. Turbulence generated by non-uniform temperature fully mixes the alloying elements with the substrate. After rapid cooling, an alloyed surface layer with superior corrosion resistance, different from the substrate, is formed.Laser Anti-Corrosion CladdingLaser anti-corrosion cladding technology applies a relatively thick layer of alloying elements onto the substrate surface. When the laser beam acts on the coating, the coated alloying elements undergo alloying reaction, forming an alloy layer that completely covers the substrate. Meanwhile, the surface layer of the substrate melts and forms a metallurgical bond with the alloy layer. The surface alloy layer isolates the substrate from corrosive media, and the corrosion resistance of the material is determined by that of the cladding layer.

Thanks to the high energy density of the laser beam and the rapid cooling rate during solidification, the laser cladding layer achieves a fine microstructure after solidification. Different cladding treatments can be performed on different parts of the same component as required. The bonding between the substrate and the cladding layer is metallurgical, and the microstructure of the cladding layer presents an obvious gradient transition characteristic. The high vertical temperature gradient during cladding can offset thermal stress caused by the difference in thermal expansion coefficients between the coating material and the substrate, avoiding severe deformation or even cracking of the material and achieving sound interfacial bonding. At present, laser surface cladding is widely used to improve the corrosion resistance of magnesium matrix composites, which inherently have poor corrosion resistance.

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