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首页> 外文期刊>Transactions of Nonferrous Metals Society of China >Effect of NiO content on corrosion behaviour of Ni-a;NiO-NiFe_2 O_4 cermets in Na_3 AlF_6-Al_2 O_3 melts
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Effect of NiO content on corrosion behaviour of Ni-a;NiO-NiFe_2 O_4 cermets in Na_3 AlF_6-Al_2 O_3 melts

机译：NiO含量对Na_3 AlF_6-Al_2 O_3熔体中Ni-a; NiO-NiFe_2 O_4金属陶瓷腐蚀行为的影响

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摘要

5N_(1-x)NiO-NiFe_2O_4 cermets with different NiO contents were prepared and the corrosion behaviour in Na_3 AlF_6-Al_2O_3 melts was investigated in laboratory electrolysis tests. The results indicate that adding NiO is unfavorable to the densification of NiFe_2O_4-NiO ceramics, while small Ni doping can greatly improve the sintering property. The electrolysis tests show that excess NiO is beneficial to the reduction of Fe while has little effects on that of Ni in the baths the steady-state concentrations of Ni, Fe are below the corresponding solubilities of NiFe_2O_(4-x)NiO, implying that corrosion mechanism changes while electrifying. Post-electrolysis examination of anodes shows that Ni metal leaches at the anode surface, yet the substrate ceramic prevents the penetration of bath and the further loss of metal phase.
机译：制备了具有不同NiO含量的5N_（1-x）NiO-NiFe_2O_4金属陶瓷，并在实验室电解测试中研究了Na_3 AlF_6-Al_2O_3熔体的腐蚀行为。结果表明，添加NiO不利于NiFe_2O_4-NiO陶瓷的致密化，而少量的Ni掺杂可以大大提高烧结性能。电解测试表明，过量的NiO有利于Fe的还原，而对镀液中的Ni的影响很小，Ni，Fe的稳态浓度低于相应的NiFe_2O_（4-x）NiO溶解度。通电时腐蚀机理发生变化。阳极的电解后检查表明，镍金属在阳极表面浸出，而基体陶瓷可防止熔池渗透，并防止金属相进一步流失。

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