Abstract Hot corrosion behaviors of TiAl coatings with different Nb and Si additions in a Na2SO4 + NaCl salt mixture at 800 °C were investigated. Corrosion kinetics was evaluated based on mass change measurements. The corrosion products and morphologies of the corrosion scales were measured by X-ray diffraction (XRD) and scanning electron microscopy (SEM). The adhesion strength of the corrosion scales was evaluated by acoustic emission (AE). High Si addition on its own and a co-addition of a high content of Si and an appropriate content of Nb improved the hot corrosion resistance of the coatings.

中文翻译：

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Nb和Si对Ti-6Al-4V合金TiAl涂层热腐蚀行为的影响

摘要 研究了不同Nb 和Si 添加量的TiAl 涂层在Na2SO4 + NaCl 盐混合物中800 °C 的热腐蚀行为。基于质量变化测量评估腐蚀动力学。通过X射线衍射（XRD）和扫描电子显微镜（SEM）测量腐蚀产物和腐蚀鳞片的形貌。通过声发射（AE）评估腐蚀垢的粘附强度。高Si单独添加以及高Si和适量Nb的共同添加提高了涂层的抗热腐蚀性能。