Niu Chao,Wang Kefeng,Li Heng,et al.Preparation and property of laser cladding coating on Q345 steel surface based on PLC control[J].Plating & Finishing,2024,(9):56-63.[doi:doi: 10.3969/j.issn.1001-3849.2024.09.008]
基于PLC控制的Q345钢表面激光熔覆涂层制备与性能研究
- Title:
- Preparation and property of laser cladding coating on Q345 steel surface based on PLC control
- Keywords:
- Q345 low alloy steel; high speed laser cladding; laser remelting; coating; hardness and corrosion resistance
- 分类号:
- TG665；TG174.4
- 文献标志码:
- A
- 摘要:
- 为了提高海洋装备用Q345低合金钢的耐蚀性，基于可编程逻辑控制器（PLC）控制高速激光熔覆与激光重熔工艺参数在Q345低合金钢表面制备了Cu-Ni合金涂层，研究了不同激光重熔速度下涂层的显微形貌、物相组成、硬度和耐蚀性。结果表明，不同激光重熔速度处理后，高速激光熔覆涂层中的微裂纹基本消失，激光重熔速度的提高会增加重熔涂层中气孔缺陷数量。随着重熔速度增加，激光重熔涂层的表面粗糙度逐渐增大，涂层中Fe、Cu和Ni元素成分分布不均匀性逐渐增大。重熔涂层的硬度高于高速激光熔覆涂层，CR1涂层的硬度最高。极化曲线和电化学阻抗谱的测试结果表明，重熔速度增加会使得涂层腐蚀电位负向移动、腐蚀电流密度增大、电荷转移电阻减小，CR1涂层的耐蚀性优于CR2、CR3和CR4涂层，CR1涂层具有最佳耐蚀性。
- Abstract:
- In order to improve the corrosion resistance of Q345 low alloy steel for marine equipment, a Cu-Ni alloy coating was prepared on the surface of Q345 low alloy steel using PLC controlled high-speed laser cladding and laser remelting process parameters. The microstructure, phase composition, hardness, and corrosion resistance of the coating were studied under different laser remelting speeds. The results showed that after different laser remelting speeds, the microcracks in the high-speed laser cladding coating basically disappeared, and an increase in laser remelting speed would increase the number of porosity defects in the remelted coating. As the remelting speed increases, the surface roughness of the laser remelted coating gradually increases, and the uneven distribution of Fe, Cu, and Ni elements in the coating gradually increases. The hardness of the remelted coating is higher than that of the high-speed laser cladding coating, with the CR1 coating has the highest hardness. The test results of polarization curves and electrochemical impedance spectroscopy show that the increase in remelting speed will cause a negative shift in the corrosion potential of the coating, an increase in corrosion current density, and a decrease in charge transfer resistance. The corrosion resistance of CR1 coating is better than that of CR2, CR3, and CR4 coatings, and CR1 coating has the best corrosion resistance
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