Effect of additive on corrosion resistance of NiFe 2O 4 ceramics as inert anodes

• Published in: Transactions of Nonferrous Metals Society of China Vol. 18; no. 2; pp. 356 - 360
• Main Authors: XI, Jin-hui, XIE, Ying-jie, YAO, Guang-chun, LIU, Yi-han
• Format: Journal Article
• Language: English
• Published: Elsevier Ltd 2008
• Subjects: additive; corrosion resistance; inert anode; NiFe 2O 4; NiFe 2O 4; corrosion resistance; inert anode; additive
• ISSN: 1003-6326
• DOI: 10.1016/S1003-6326(08)60062-X

In order to improve the corrosion resistance of NiFe 2O 4 ceramics as inert anode, additive V 2O 5 was added to raw materials NiO and Fe 2O 3. The inert anodes of nickel-ferrite ceramics were prepared by powder metallurgic method and the static corrosion rate in Na 3AlF 6-Al 2O 3 was determined by mass loss measurement. The effect of V 2O 5 on sintering property and corrosion resistance was studied. The results show that V 2O 5 can promote the grain to develop completely and improve sintering property. EDS results show the reaction product Ni 2FeVO 6 distributes along the grain boundary. The corrosion tests show that V 2O 5 is beneficial to improving corrosion resistance remarkably. The reasons that V 2O 5 can improve the corrosion resistance must be V 2O 5 promoting the gains to develop completely and Ni 2FeVO 6 distributes along the grain boundary. The stable structure can control the chemical dissolution of ceramics anode and the reinforced grain boundary can control the grain-boundary corrosion rate.