本文研究了在950℃空气中,表面涂Na_2SO_4盐膜的条件下,NiAl,NiAl-20%Fe及渗铝后的高温热腐蚀行为。在热腐蚀过程中,NiAl合金表面能形成Al_2O_3膜,显示出一定的耐蚀性能。但Al_2O_3膜易开裂,Al_2O_3膜的溶解及开裂会引发合金发生快速热腐蚀;20%Fe的加入则使NiAl合金的耐蚀性能显著变差,合金表面不能形成单一的Al_2O_3膜;渗铝处理可以明显提高NiAl-20%Fe合金的耐蚀性能,且渗铝涂层的耐蚀性能优于NiAl合金,这与铝化物涂层中的Al含量较高,Al_2O_3膜的开裂倾向较小有关。
The behaviours of high temperature hot corrosion of NiAl, NiAl-20%Fe (atom fraction) without and with aluminized coating in the presence of Na_2SO_4 film at 950℃in air were conducted. NiAl alloy shows hot corrosion resistance to some extent by the formation of Al_2O_3 scale. But, the cracking and dissolution of Al_2O_3 scale may cause its rapid hot corrosion. Additives of 20%Fe may deteriorate the hot corrosion resistance owing to the absence of an Al_2O_3 scale. Aluminizing treatment may improve corrosion resistance of NiAl-20%Fe by promoting the formation of an Al_2O_3 scale. NiAl-20%Fe with aluminide coating has slower corrosion rate than NiAl alloy, which may be attributed to that the aluminide coating has higher Al content, and the Al_2O_3 scale in coating has better cracking resistance than NiAl alloy.(Correspondent: ZENG Chaoliu, Institute of Corrosion and Protection of Metals, Chinese Academy of Sciences,Shenyang 110015)
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