In engineering, there are major concerns about cavitation wear, as well as erosion, caused by the transport of abrasive sediments in hydraulic installations, like pumps and turbines, due to the damage these phenomena can cause in pumping stations and hydroelectric plants. Several studies are proposed to reduce this problem, like component design alteration and deposition of coatings with different materials that can be optimized for different wear issues. The objective of this work was to characterize and analyze the cavitation erosion of AISI 1020 steel samples coated with WC₁₀Co₄Cr deposited by high-velocity oxy fuel (HVOF) and laser-remelted with CO₂ laser beam to evaluate the influence of this process in the cavitation erosion resistance of the coating. Microstructure, before and after laser treatment, was analyzed by means of optical and scanning electronical microscopy with SEM/EDS, indicated the metallurgical bonding between substrate and coating and a thickness reduction in the initial coating sprayed by HVOF of 100–35 µm after laser irradiation, with an enhanced coating hardness (20%) near the surface. The cavitation erosion resistance evaluated using vibratory ultrasonic equipment, according ASTM G32-92 standard, indicated a reduction of 40% after laser treatment. This performance could be attributed to the surface densification of the HVOF-sprayed coating.

在工程中，由于磨蚀性沉积物在泵站和水力发电厂中造成的损坏，在水力装置（如泵和涡轮机）中运输的磨蚀性沉积物引起的气蚀磨损和侵蚀是人们最主要的担忧。提出了一些研究来减少这个问题，例如部件设计变更和使用可以针对不同磨损问题进行优化的不同材料进行的涂层沉积。这项工作的目的是表征和分析AISI 1020钢样品的气蚀腐蚀，该样品被高速氧燃料（HVOF）沉积并用CO ₂激光重熔涂覆了WC ₁₀ Co ₄ Cr涂层激光束以评估该过程对涂层抗气蚀性的影响。通过光学和扫描电子显微镜用SEM / EDS对激光处理前后的显微结构进行了分析，结果表明基材和涂层之间的冶金结合以及HVOF喷涂后初始涂层的厚度减小了HVOF，喷涂厚度为100-35 µm ，在表面附近具有增强的涂层硬度（20％）。根据ASTM G32-92标准，使用振动超声设备评估的抗气蚀性能表明，激光处理后降低了40％。该性能可归因于HVOF喷涂涂层的表面致密化。