Preparation and property of laser cladding coating on Q345 steel surface based on PLC control
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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