Abstract Hot corrosion behaviour of nickel-based aluminide coatings with different thicknesses of initial Pt plating was evaluated in the Na 2 SO 4 /NaCl (75:25, wt./wt.) salt mixture at 900 °C. Compared to plain aluminide, the Pt-modified coatings showed better hot corrosion resistance by hindering the outward diffusion of undesirable elements from the substrate alloy. Pre-oxidation was confirmed to be capable of preventing molten salt from accessing the alloy surface and reversibly dissolving the oxide scale. Oxide growth and dissolution, acting as two competitive processes, occurred simultaneously and had an important impact on the entire performance of the Pt-modified aluminide coatings in hot corrosion.

中文翻译：

---

单相铂改性铝化物涂层的热腐蚀行为：铂含量和预氧化的影响

摘要 在 Na 2 SO 4 /NaCl (75:25, wt./wt.) 盐混合物中，在 900 °C 下评估了不同初始 Pt 镀层厚度的镍基铝化物涂层的热腐蚀行为。与普通铝化物相比，Pt 改性涂层通过阻止有害元素从基体合金向外扩散而表现出更好的抗热腐蚀性能。证实预氧化能够防止熔盐进入合金表面并可逆地溶解氧化皮。氧化物的生长和溶解作为两个竞争过程同时发生，并对 Pt 改性铝化物涂层在热腐蚀中的整体性能产生重要影响。