| Electrolys is plays a particularly important role in the extraction of non-ferrous metals.The electrode material as a key factor in the electrodeposition system will directly affect the entire electrochemical reaction process.The electrode material was also used to achieve non-ferrous metal hydrometallurgy."Low energy consumption and high output",the key to production methods.Based on the support of the National Natural Science Foundation of China,this article creatively proposes a new composite electrode substrate with TiB 2+Ti4O7 ceramic layer coated with A1 group.This article starts with the selection of the electrode substrate and the surface coating layer.Through the research on the structure and composition of the base material,according to the designability and superimposition of the composite material,the combination of cermet TiB 2+Ti4O7 has strong corrosion resistance and good conductivity characteristics.Using rolling method,solid-solid hot press diffusion method,plasma spraying method to p repare Al/TiB2+Ti4O7 composite electrode matrix material,in order to improve the electrochemical performance of electrode material,tests and analyzes the electroch emical performance of the composite electrode matrix material and the composite interface,discusses the influence of the electrode matrix material preparation process and the production process parameter value on the electrochemical performance of the ele ctrode matrix,and then analyzes the key factors affecting the new electrode matrix lay the theory and preparation foundation for the research and development of new composite electrode materials.The main research results of this paper are as follows:(1)According to the design feasibility and theoretical analysis of the layered composite electrode interface,by using the complementary effect of material superposition,by changing the structural mode of traditional lead and titanium electrodes as the matrix,Al with excellent electrical conductivity and excellent performance was adopted as the matrix material.TiB2+Ti4O7 was a coating layer that achieves improved corrosion resistance of electrode materials,more uniform surface current distribution and impr oved electrocatalytic activity.Combining A1 and TiB2+Ti4O7 wettability in the preparation process and the calculation of Gibbs free energy that may occur in the chemical reaction process show that A1 and TiB 2+Ti4O7have good wettability,But A1 and TiB 2 are unlikely to undergo a chemical reaction process G?>0,according to the Gibbs free energy A1 and Ti4O7 of the calculated chemical formula may react.At the same time,A1 atoms are more active,Al can fill the grain gap of TiB2+Ti4O7,which lays the foundation for its excellent conductive properties.(2)The electrode matrix material was prepared by rolling method,and it was found through parameter optimization experiment analysis that better performance can be prepared when the rolling temperature was 450?,the Ti4O7content was 10%,and the rolling reduct ion rate was greater than 75%.A layered composite electrode substrate with better performance was prepared;the Al-plate and TiB2+Ti4O7 plate were combined by the solid-solid hot-press diffusion composite method,and it was found that the interface had me tallurgical bonding in addition to mechanical bonding;adopt orthogonal test method to develop the spray output power,powder feed amount,spray distance,Ar gas flow rate of plasma sprayed Al/TiB 2+Ti4O7 composite metal ceramic coating optimization of the parameters of the preparation process.Through the factor effect diagram and the range value,the most important factor affecting the coating porosity was the spray power.When the plasma spraying power was 38Kw,the interface conductivity of the electrode substrate was 2.47?105S/cm,and the corrosion current density of the electrode substrate was 0.130×10-4A/cm2 by Tafel curve test.(3)The physical properties of the Al matrix and TiB 2+Ti4O7 ceramics was quite different.Through process improvements such a s adding Ni Al to make the bottom layer to relieve the stress concentration of the coating,reduce d the difference in thermal expansion coefficient,improve d its bonding strength,and improve the physical properties of the powder.After the process was improved,a micro-melting pool was formed in the local area of the electrode substrate to achieve microscopic metallurgical bonded.Although the conductivity of the electrode substrate has decreased compared with that before the process improvement,the corrosion current density of the electrode base material after the process improvement was0.718×10-5A/cm2,and the corrosion resistance has been greatly improved compared with before the process improvement.(4)By compared different preparation methods of electrode substrate materials,the cost of preparing the electrode substrate by rolling method was low,the process was short,and the corrosion resistance of the electrode substrate was poor;the process of prepared the electrode material by the solid-solid hot-press diffusion composite method was more,the preparation process parameters can not be controlled;although the material cost of the electrode d substrate prepared by plasma spraying was relatively high,the electrode substrate d has excellent conductivity and corrosion resistance,which provides a direction for the development of new electrodes in the future. |
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