Hulka Iosif, Uțu Ion D, Avram Diana, Dan Mircea L, Pascu Alexandru, Stanciu Elena M, Roată Ionuț C
Research Institute for Renewable Energie, Politehnica University of Timişoara, G. Muzicescu 138, 300501 Timişoara, Romania.
Faculty of Mechanics, IMF Department, Politehnica University of Timişoara, Blvd. M. Viteazu 1, 300222 Timişoara, Romania.
Materials (Basel). 2021 Sep 26;14(19):5583. doi: 10.3390/ma14195583.
To enhance the sliding wear and corrosion behavior of steels with low carbon content, cermet composite coatings are usually deposited on their surface by various deposition processes. Laser cladding, compared to other deposition techniques such as electroplating, arc welding, and thermal spraying, has numerous advantages to produce such protective coatings. The paper presents the optimization of laser cladding deposition speed versus energy density in order to obtain WC-Co/NiCrBSi coatings with Ni-Al addition free of defects and reduced porosity deposited on low carbon steel substrate. The microstructure and chemical composition were investigated by SEM combined with EDX analysis while XRD was performed in order to examinate the phases within the coatings. In order to investigate the cladding speed influence on the coatings, hardness measurements, POD (pin on disk) wear tests and corrosion tests in 3.5% NaCl solution were carried out. The results showed that an optimal cladding speed has a crucial impact on the microstructure, composition, and hardness. It was found out that optimizing the cladding deposition speed proved to be effective in enhancing the sliding wear resistance and corrosion behavior by controlling the iron content within the coatings.
为提高低碳钢的滑动磨损和耐腐蚀性能，通常通过各种沉积工艺在其表面沉积金属陶瓷复合涂层。与电镀、电弧焊和热喷涂等其他沉积技术相比，激光熔覆在制备此类防护涂层方面具有诸多优势。本文介绍了激光熔覆沉积速度与能量密度的优化，以获得在低碳钢基体上沉积的无缺陷、孔隙率降低且添加了Ni-Al的WC-Co/NiCrBSi涂层。通过扫描电子显微镜（SEM）结合能谱分析（EDX）研究了微观结构和化学成分，同时进行了X射线衍射（XRD）分析以检测涂层中的相。为研究熔覆速度对涂层的影响，进行了硬度测量、销盘（POD）磨损试验以及在3.5%氯化钠溶液中的腐蚀试验。结果表明，最佳熔覆速度对微观结构、成分和硬度具有至关重要的影响。研究发现，通过控制涂层中的铁含量，优化熔覆沉积速度被证明在提高滑动耐磨性和耐腐蚀性能方面是有效的。
