This study aims to investigate the effects of growing niobium carbide (NbC) particles into intermetallic iron-aluminide (FeAl) coatings on ductile cast iron (SGI) by thermo-reactive diffusion technique (TRD). The study compares the corrosion and oxidation behavior of the FeAl-NbC coatings with SGI, FeAl, and NbC coatings. Corrosion tests were conducted through polarization tests in a 3.5 wt% NaCl solution, while oxidation tests were performed at 900 °C for 4, 16, and 64 h. Before and after corrosion and oxidation tests, the coatings were examined using scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS), and X-ray diffraction (XRD). The findings show that FeAl coatings with NbC particles had lower graphite nodules, porosity, and surface roughness values compared to FeAl coatings. FeAl-NbC composite coatings provided better corrosion and oxidation resistance compared to untreated SGI, FeAl, and NbC coatings. The results of the comparative analysis of FeAl-NbC, FeAl, NbC, and untreated SGI specimens indicate that corrosion resistance in a 3.5 wt% NaCl solution and oxidation resistance at 900 °C followed the order FeAl-NbC > FeAl > NbC > SGI.

中文翻译：

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金属间铁铝化物涂层中难熔 NbC 析出物的掺入对腐蚀和高温氧化行为的影响

本研究旨在研究通过热反应扩散技术 (TRD) 将碳化铌 (NbC) 颗粒生长到球墨铸铁 (SGI) 上的金属间铁铝化物 (FeAl) 涂层中的效果。该研究将 FeAl-NbC 涂层与 SGI、FeAl 和 NbC​​ 涂层的腐蚀和氧化行为进行了比较。腐蚀测试通过在3.5 wt% NaCl溶液中的极化测试进行，而氧化测试在900℃下进行4、16和64小时。在腐蚀和氧化测试之前和之后，使用扫描电子显微镜 (SEM)、能量色散光谱 (EDS) 和 X 射线衍射 (XRD) 对涂层进行检查。研究结果表明，与 FeAl 涂层相比，含有 NbC 颗粒的 FeAl 涂层具有较低的石墨球、孔隙率和表面粗糙度值。与未经处理的 SGI、FeAl 和 NbC​​ 涂层相比，FeAl-NbC 复合涂层具有更好的耐腐蚀性和抗氧化性。 FeAl-NbC、FeAl、NbC 和未处理的 SGI 试样的对比分析结果表明，在 3.5 wt% NaCl 溶液中的耐腐蚀性和 900 ℃ 下的抗氧化性遵循 FeAl-NbC > FeAl > NbC > SGI 的顺序。