Pneumatic conveying pipe is an important part of the coal industry. Its working environment is harsh, and it is mainly affected by serious wear and corrosion, which affects its operating life. Studying a method of strengthening the pipe wall of pneumatic conveying pipe is of great significance. In this paper, nickel-based alloy coatings with different WC (tungsten carbide) contents were prepared using an oscillating laser-cladding process, and the micro-characterization characteristics, wear resistance and corrosion resistance of the laser-cladded layer were discussed. The main conclusions are as follows: The microstructure of the laser-cladded layer gradually grows from the plane crystals and cellular crystals at the bottom to the relatively coarse columnar crystals in the middle, and finally to a large number of equiaxed crystals in the upper part. Moreover, with an increase in WC content, more fine equiaxed crystals are formed, mainly due to the decrease in temperature gradient with the increase in distance from the fusion line. Also, with an increase in WC content, the hardness and wear resistance of the nickel-based alloy are improved. When 20% WC is added, the laser-cladded layer shows the best corrosion resistance in 3.5 wt.% NaCl solution, and its polarization resistance is 16% lower than that when 10% WC is added. This study provides a technical reference for improving the operating life of pneumatic conveying pipelines.

The challenging wind conditions surrounding power transmission lines exacerbate the wear and corrosion of transmission line fittings. Thermal diffusion galvanizing technology, a novel method for obtaining galvanizing layers, significantly enhances the wear and corrosion resistance of metal components, thereby extending their service life. Holding temperature plays a critical role in determining the performance of the thermally diffused zinc coating. In this study, we prepared thermally diffused zinc coatings containing rare earth oxides on 35CrMo steel at various holding temperatures and evaluated their morphology, wear resistance, and corrosion resistance. The findings indicate that increasing the holding temperature enhances the diffusion of zinc and iron, yielding thicker coatings with a maximum thickness of 60 μm at a holding temperature of 450 °C. Notably, the zinc coating produced at a holding temperature of 410 °C exhibits optimal wear resistance at room temperature, and the wear failure mechanisms were predominantly abrasive wear and oxidative wear with slight adhesive wear. In addition, the zinc coating produced at a holding temperature of 430 °C exhibits optimal corrosion resistance at room temperature.