利用XRD, TGA, SEM/EDS等方法, 研究了(Ni, Pd)Al 涂层在纯Na2SO4以及Na2SO4+25%NaCl两种熔盐环境中的高温抗热腐蚀行为. 结果表明,与NiAl涂层相比, (Ni,Pd)Al涂层900℃下具有较好的抗高温热腐蚀性能. 添加改性元素Pd, 阻碍了S进一步向涂层内层扩散, 提高了铝化物涂层的抗高温腐蚀性能.
The high temperature hot corrosion behavior of the (Ni, Pd)Al coating coated with Na2SO4 or Na2SO4+25%NaCl at 900℃ was investigated by TGA, XRD, SEM/EDS. Results show that (Ni, Pd)Al coating has higher oxidation resistance than the NiAl coating. The modified element Pd incorporating into the aluminide coating hinders the diffusion of S into the inner part of the coating matrix, and increases the hot corrosion resistance of the aluminide coating.
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