During operation of gas turbine engines, different salts develop that lead to a hot-corrosion attack. While the hot corrosion associated with Na 2 SO 4 and Na 3 VO 4 has received considerable attention, MgSO 4 is also a main salt component, but it has received limited examination. For operation at temperatures beyond the capabilities of Ni-base superalloys, refractory-metal alloys with a Mo–Si–B-based coating have demonstrated a robust environmental resistance including hot corrosion attack by Na 2 SO 4 and Na 3 VO 4 . In order to evaluate the performance of Mo with a Mo–Si–B-based amorphous coating, samples were exposed to MgSO 4 under thermal cycling at temperatures from 800 to 1300 °C. Mass change measurements revealed minimal attack from the MgSO 4 exposure except in local regions where cristobalite and MgMoO 4 were detected. Even with the local region reaction, the mass change after a cumulative 100 h of exposure was about 3.5 mg/cm 2 . Exposure to a composite salt mixture containing Na 2 SO 4 , NaVO 3 , MgSO 4 , CaCl, and KCl revealed signs of interactivity compared to the corrosion due to the separate effects of the individual salts, but again the mass change stabilized to a minimal level demonstrating that the Mo–Si–B-based coating is resilient to hot corrosion.

中文翻译：

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Mo-Si-B 基涂层对环境盐基热腐蚀的抵抗力

在燃气涡轮发动机的运行过程中，会产生不同的盐分，导致热腐蚀。虽然与 Na 2 SO 4 和 Na 3 VO 4 相关的热腐蚀受到了相当多的关注，但 MgSO 4 也是主要的盐成分，但它受到的研究有限。为了在超出 Ni 基高温合金能力的温度下运行，具有 Mo-Si-B 基涂层的难熔金属合金表现出强大的环境耐受性，包括 Na 2 SO 4 和 Na 3 VO 4 的热腐蚀侵蚀。为了评估具有 Mo-Si-B 基非晶涂层的 Mo 的性能，样品在 800 至 1300 °C 的温度下在热循环下暴露于 MgSO 4 中。除了在检测到方石英和 MgMoO 4 的局部区域外，质量变化测量显示来自 MgSO 4 暴露的侵蚀最小。即使有局部区域反应，累积暴露 100 小时后的质量变化约为 3.5 mg/cm 2 。暴露于含有 Na 2 SO 4 、NaVO 3 、MgSO 4 、CaCl 和 KCl 的复合盐混合物中，由于各个盐的单独作用，与腐蚀相比显示出相互作用的迹象，但质量变化再次稳定在最低水平证明 Mo-Si-B 基涂层对热腐蚀具有弹性。