研究了Ｎａ_２ＳＯ_４沉积盐引起的Ｎｉ_３Ａｌ－Ｆｅ于７００一８２０℃空气中的腐蚀行为。结果表明，Ｎｉ_３Ａｌ－Ｆｅ遭受自持性的热腐蚀。热腐蚀的发生似可归因于Ｆｅ与Ｎａ_２ＳＯ_４反应的产物Ｎａ_２Ｏ与Ｎａ_２ＳＯ_４形成了Ｎａ_２Ｏ－Ｎａ_２ＳＯ_４共晶熔融盐，随后合金中Ｍｏ的氧化产物ＭｏＯ_３参与电化学阴极还原反应，从而引发合金快速的热腐蚀。此外，熔盐中Ｎａ_２ＳＯ_４与ＭｏＯ_３反应生成的ＳＯ_３导致了熔盐的高酸度和合金的内硫化，从而进一步加剧了腐蚀的进程。
Ni_3Al-Fe suffers from catastrophic hot corrosion in the presence of Na_2SO_4 salt film at 700- 820 ℃,which may be ascribed to the formation of eutectic Na_2O-Na_2SO_4 melt produced by the reaction between Fe and Na_2SO_4 . Then, MoO_3, the oxidation product of Mo in the alloy, may also contribute to the electrochemical cathodic reduction, and induce rapid corrosion of Ni_3Al-Fe. The acidic conditions of molten salts established by the SO_3 produced by the reaction between Na_2SO_4 and MoO_3,and the internal sulphidation along substrate alloy may also accelerate the corrosion of Ni_3Al-Fe.
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| [7] | 李辉,郭建亭,谭明晖,孙超,赖万慧,王淑荷,金属学报,1992 |
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