Influence of gaseous atmosphere on electrochemical behavior of nickel alloys in LiCl-KCl-Na2SO4 at 700 °C
Influence of gaseous atmosphere on electrochemical behavior of nickel alloys in LiCl-KCl-Na2SO4 at 700 °C
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DOI：
10.1016/j.corsci.2018.05.039
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发表时间：
2018-09
影响因子：
8.3
通讯作者：
Kuldeep Kumar;Jarrod Gesualdi;N. Smith;Hojong Kim
中科院分区：
文献类型：
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作者：
Kuldeep Kumar;Jarrod Gesualdi;N. Smith;Hojong Kim
研究了Ni、β-NiAl、β-NiAl/Cr合金在LiCl-KCl-Na 2SO 4电解液中700 °C、Ar、O2、O2-0.1%SO2气氛下的电化学行为。在氧化气氛中，由于NiO的不稳定性，Ni迅速降解，并且β-NiAl上的富氧化铝氧化皮提供了有限的热腐蚀保护（例如，在O2-0.1%SO2条件下，氧化膜开裂;而Al和Cr的同时加入，在氧化气氛中形成混合氧化物（Al 2 O3-Cr2 O3）膜，提高了耐蚀性。在镍合金的热腐蚀过程中，气氛和合金元素影响熔盐中氧化膜的形成和稳定性。
Electrochemical behavior of Ni alloys (Ni, β-NiAl, β-NiAl/Cr) was investigated in LiCl-KCl-Na2SO4electrolyte at 700 °C under three gaseous atmospheres (Ar, O2, O2-0.1%SO2). In oxidizing atmospheres, Ni rapidly degraded due to instability of NiO, and alumina-rich scale on β-NiAl provided limited protection against hot corrosion (e.g., cracks in the scale under O2-0.1%SO2); however, the addition of both Al and Cr resulted in enhanced corrosion resistance by forming a mixed-oxide (Al2O3-Cr2O3) scale in oxidizing atmospheres. In hot corrosion processes of Ni alloys, the formation and stability of oxide scales in the molten salt were influenced by gaseous atmosphere and alloying elements.