Wierzbowska Karolina, Kochmańska Agnieszka Elżbieta, Kochmański Paweł
Faculty of Mechanical Engineering and Mechatronics, West Pomeranian University of Technology in Szczecin, Av. Piastow 17, 70-310 Szczecin, Poland.
Materials (Basel). 2021 Dec 27;15(1):162. doi: 10.3390/ma15010162.
A new slurry cementation method was used to produce silicide-aluminide protective coatings on austenitic stainless steel 1.4541. The slurry cementation processes were carried out at temperatures of 800 and 1000 °C for 2 h with and without an additional oxidation process at a temperature of 1000 °C for 5 min. The microstructure and thickness of the coatings were studied by scanning electron microscopy (SEM). The intention was to produce coatings that would increase the heat resistance of the steel in a nitriding atmosphere. For this reason, the produced coatings were subjected to gas nitriding at a temperature of 550-570 °C in an atmosphere containing from 40 to 60% of ammonia. The nitriding was carried out using four time steps: 16, 51, 124, and 200 h, and microstructural observations using SEM were performed after each step. Analysis of the chemical composition of the aluminide coatings and reference sample was performed using wavelength (WDS) and energy (EDS) dispersive X-ray microanalysis, and phase analysis was carried out using X-ray diffraction (XRD). The resistance of the aluminide coatings in the nitriding atmosphere was found to depend strongly on the phase composition of the coating. The greatest increase in resistance to gas corrosion under nitriding atmosphere conditions was achieved using a manufacturing temperature of 1000 °C.
采用一种新型的熔盐渗金属法在1.4541奥氏体不锈钢上制备硅化物-铝化物防护涂层。熔盐渗金属过程在800和1000℃下进行2小时，其中一部分在1000℃下额外进行5分钟的氧化处理，另一部分则不进行。通过扫描电子显微镜（SEM）研究涂层的微观结构和厚度。目的是制备出能提高钢在渗氮气氛中耐热性的涂层。因此，将制备好的涂层在含40%至60%氨的气氛中于550 - 570℃进行气体渗氮处理。渗氮分四个时间阶段进行：16、51、124和200小时，每个阶段后使用SEM进行微观结构观察。使用波长（WDS）和能量（EDS）色散X射线微分析法对铝化物涂层和参考样品进行化学成分分析，并使用X射线衍射（XRD）进行相分析。发现铝化物涂层在渗氮气氛中的抗性很大程度上取决于涂层的相组成。在渗氮气氛条件下，使用1000℃的制造温度可实现对气体腐蚀抗性的最大提高。
