Corrosion behavior of Ce-doped Ni-10Cu-11Fe-6Al（wt%） inert anode in molten CaCl2 salt
来源期刊：Journal of Rare Earths2019年第2期
论文作者：Mehdi Alzamani Kourosh Jafarzadeh Arash Fattah-alhosseini
文章页码：218 - 224
摘 要：In this research the effect of cerium dopingon corrosion behavior of Ni-10 Cu-11 Fe-6 Al（wt%） alloy as a novel inert anode in titanium electrolytic production was investigated. The samples, including un-doped and Ce-doped nickel-based alloys, were prepared using vacuum induction melting（VIM） process and then exposed to the electrolysis in molten calcium chloride at 900C at à1.6 V versus graphite reference electrode for different immersion time. The surface and cross-section of the samples were characterized using scanning electron microscopy（SEM）, and their electrochemical behavior was investigated by electrochemical impedance spectroscopy（EIS）. The results show that the un-doped samples have greater number of voids and porosities as compared to that of the 0.0064 wt% Ce-doped samples（as the optimum content of cerium in the alloy）. Thus, the nickel-based alloy becomes less sensitive to the pitting by addition of cerium. The corrosion penetration depth reaches about 244 mm after 16 h of electrolysis in the un-doped sample, while was approximately 103 mm for the 0.0064 wt% Ce-doped sample, which is an indication that the corrosion penetration depth decreases by adding small amounts of Ce.
Mehdi Alzamani1，Kourosh Jafarzadeh1，Arash Fattah-alhosseini2
1. Malek Ashtar University of Technology2. Department of Materials Engineering, Bu-Ali Sina University
摘 要：In this research the effect of cerium dopingon corrosion behavior of Ni-10 Cu-11 Fe-6 Al（wt%） alloy as a novel inert anode in titanium electrolytic production was investigated. The samples, including un-doped and Ce-doped nickel-based alloys, were prepared using vacuum induction melting（VIM） process and then exposed to the electrolysis in molten calcium chloride at 900C at à1.6 V versus graphite reference electrode for different immersion time. The surface and cross-section of the samples were characterized using scanning electron microscopy（SEM）, and their electrochemical behavior was investigated by electrochemical impedance spectroscopy（EIS）. The results show that the un-doped samples have greater number of voids and porosities as compared to that of the 0.0064 wt% Ce-doped samples（as the optimum content of cerium in the alloy）. Thus, the nickel-based alloy becomes less sensitive to the pitting by addition of cerium. The corrosion penetration depth reaches about 244 mm after 16 h of electrolysis in the un-doped sample, while was approximately 103 mm for the 0.0064 wt% Ce-doped sample, which is an indication that the corrosion penetration depth decreases by adding small amounts of Ce.
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