The hot corrosion behaviors of the aluminide coatings with different treatments on the surface of Ni-based alloy at high temperature were investigated. The aluminide coating modified by three different methods (pretreatment, Pt-modification and both), and then all the specimens were oxidized in lab air with NaCl salt at 1050 C. During cycle oxidation, oxide scales on the surface of the aluminide coatings presented different morphologies, composition and corrosion behaviors. The oxide scale on the surface of the as-received aluminide coating without any treatments showed a poor dense and a bad adherence. However, the oxide scale on the surface of the aluminide coating with both Pt-modification and pre-oxidation exhibited the best hot corrosion resistance. In the NaCl corrosion environment, different treatments resulted in different corrosion mechanisms. Without any treatments, the oxide scale with NaCl at high temperature occurred internal active oxidation, which could promote the corrosion process and form the pores in the oxide scale. The internal active oxidation also presented in the oxide scale on the surface of the aluminide coating with pre-oxidation.

研究了不同处理方式对铝基涂层在高温下镍基合金表面的热腐蚀行为。通过三种不同的方法（预处理，Pt改性和两种方法）对铝化物涂层进行改性，然后将所有标本在实验室空气中用NaCl盐在1050℃下氧化。在循环氧化过程中，铝化物涂层表面的氧化皮呈现出不同的状态形态，成分和腐蚀行为。未经处理的原样铝化物涂层表面的氧化皮显示出较差的致密性和不良的粘附性。然而，经过Pt改性和预氧化的铝化物涂层表面的氧化皮表现出最佳的抗热腐蚀性能。在NaCl腐蚀环境中，不同的处理导致不同的腐蚀机理。如果不进行任何处理，则在高温下用NaCl进行的氧化皮会发生内部活性氧化，这可能会促进腐蚀过程并在氧化皮中形成孔。内部活性氧化也以预氧化的形式出现在铝化物涂层表面的氧化皮上。