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On the Electrolytic Corrosion Behavior of Cu-Ni-NiO-NiFe2O4 Cermets in Cryolite-alumina Melts

Author: DuanHuaNan
Tutor: Li；LaiYanQing
School: Central South University
Course: Non-ferrous metallurgy
Keywords: Aluminum inert anodes Cermet , Cu-Ni-NiO-NiFe2O4 Cryolite - alumina melts Corrosion resistance Distribution of impurity ions
CLC: TG172.9
Type: Master's thesis
Year: 2005
Downloads: 174
Quote: 5
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Abstract


Inert anode technology can reduce the cost of production of electrolytic aluminum, energy yield, and environment-friendly, it will bring development and application of traditional aluminum industry technological revolution; However, the technology has yet to be successful, the problem is mainly concentrated in the physical properties of the materials and resistance to fluoride salt melt corrosion in two ways. 973 plans and 863 plans funded the development of inert anodes for aluminum electrolysis target, select the Cu-Ni-NiO-NiFe 2 O 4 cermet object , research from ceramic phase and metal phase two. In the the qualified samples prepared on the basis of \metal phase species (mixed powder of Ni, Cu and Cu-Ni) cermet inert anode corrosion resistance, density and conductivity of the impact and Preliminary corrosion behavior and conduction mechanism. Main results are as follows: 1) the improvement of ceramic phase NiO content is not conducive to the NiFe 2 O 4 -NiO ceramics sintered densification; but adding 5wt% Ni metal phase , can significantly increase the sample density and conductivity was sintered in a controlled atmosphere, wherein 1350 ℃ sintered the the two hours 5Ni-9.5NiO of-of NiFe 2 O 4 The cermet apparent density of 5.57g · cm -3 , the relative density of up to 98.11%; 1000 ° C temperature conductivity 39.61S · cm -1 . 2) improve 5Ni-xNiO-NiFe 2 O 4 cermet NiO content in the of Na 3 AlF 6 < / sub>-Al 2 O 3 Fe content in the electrolyte in the electrolytic corrosion process in the melt from 0.01857wt% to 0.006836wt% ~~ 0.009574wt% little effect on the Ni content. Considering the sintering properties and the corrosion resistance, to determine the optimum content of the ceramic phase of NiO was 10wt%. 3) The metal phase, respectively, Cu, Ni, and 85Cu-15Ni mixed powder cermet density less; metal phase of Cu metal-ceramic high temperature conductive preferably at 960 ° C reaches 81.17S · cm -1 . Currently limited polarized and non-polarized corrosion experiment also failed to effectively distinguish them corrosion-resistant properties of the pros and cons, which is mainly due to the difficulty and complexity of the high-temperature molten salt corrosion experiments lead to larger error of the data obtained by needed a large number of experimental studies. 4) cermet Na 3 AlF 6 -Al 2 O 3 melt electrolytic corrosion into the melting The non-uniform distribution of impurity ions of the body was, broadly in line with the Boltzmann distribution law changes with the distance from the anode. The reason for this phenomenon may be caused by the the impurity ions cathode enrichment polarization under the conditions of the electro-migration of impurity ions; non-uniform distribution of the different calculation methods have a greater impact on inert anode corrosion rate, urgent need to establish a set of scientific and rational inert anode corrosion rate of inspection

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CLC: > Industrial Technology > Metallurgy and Metal Craft > Metallurgy and Heat Treatment > Metal corrosion protection,metal surface treatment > Various types of metal corrosion > Other corrosion
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