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工作于低功率工况的燃气轮机动叶片和导向叶片材料在600℃～75℃产生一种低温热腐蚀。本文使用盐淋浴方法研究了In939,U500和543镍基高温合金于Na_2SO_4和NaCl混合盐中750℃热腐蚀性能。用电子探针和X射线衍射分析对腐蚀产物进行了分析。试验结果表明,In939合金在750℃时热腐蚀抗力低于另外两种合金。然而,三种合金产生热腐蚀的机制是一致的。由于腐蚀环境中有足够高的SO_3分压,促使试样表面的NiO硫化而生成Na_2SO_4和NiSO_4低熔共晶,因此加速硫化一氧化过程。
Gas turbine rotor blades and guide vane materials operating at low power conditions produce a low temperature hot corrosion at 600 ° C to 75 ° C. In this paper, hot corrosion behaviors of In939, U500 and 543 nickel base superalloys at 750 ℃ in mixed salt of Na_2SO_4 and NaCl were studied by salt shower method. Corrosion products were analyzed by electron probe and X-ray diffraction analysis. The test results show that, In939 alloy hot corrosion resistance at 750 ℃ lower than the other two alloys. However, the mechanism of hot corrosion of the three alloys is consistent. Due to the sufficiently high SO_3 partial pressure in the corrosive environment, NiO on the sample surface is promoted to form low-eutectic Na_2SO_4 and NiSO_4 eutectic, thereby accelerating the sulfidation and oxidation process.