Abstract Hot corrosion is a serious problem in gas turbines due to poor quality fuels which contain Na, V, S and Cl. To resolve the problem, Cr-aluminide was coated on IN-738LC superalloy with a two steps pack cementation process. Oxidation behavior and near-surface microstructure of the coating showed consecutive increase in destruction by exposition to Na2SO4, 75Na2SO4 + 25 V2O5 and 70Na2SO4 + 25 V2O5 + 5NaCl (wt.%). Kinetic studies indicated parabolic corrosion rate in salt-less samples due to diffusion. Similar expression for salt-covered samples was assessed for oxide dissolution. Plate-like, broken-plate-like and cauliflower-like morphologies attributed to the corrosion products were observed after exposition to above three salts, respectively.

中文翻译：

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暴露于 Na 2 SO 4 、Na 2 SO 4 + V 2 O 5 和 Na 2 SO 4 + V 2 O 的 Inconel 738LC 上的“低温高活性 Cr-铝化物”涂层的热腐蚀行为和近表面微观结构5 + NaCl 900 °C

摘要 由于含有 Na、V、S 和 Cl 的劣质燃料，热腐蚀是燃气轮机中的一个严重问题。为了解决这个问题，采用两步填充胶结工艺在 IN-738LC 高温合金上涂覆 Cr-铝化物。涂层的氧化行为和近表面微观结构显示，暴露于 Na2SO4、75Na2SO4 + 25 V2O5 和 70Na2SO4 + 25 V2O5 + 5NaCl (wt.%) 后，破坏连续增加。动力学研究表明，由于扩散，无盐样品中的抛物线腐蚀速率。针对氧化物溶解评估盐覆盖样品的类似表达。在暴露于上述三种盐后，分别观察到由腐蚀产物引起的板状、碎板状和菜花状形态。