采用料浆法在Ni基高温合金上制备了Al-Si扩散涂层,研究了表面涂覆75mass%Na2SO4+K2SO4盐膜的基体合金和Al-Si涂层在900℃空气中的热腐蚀行为.结果表明,铸态合金遭受了灾难性的热腐蚀,合金出现严重的内硫化和内氧化,而Al-Si涂层由于表面生成致密的、保护性Al2O3膜,以及涂层中Cr元素和一些富Si相的有益作用而表现出优异的抗热腐蚀性能.
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