Pulse Electrodeposition And Characterization Of Electrochemical Properties Of Rod-shaped Titanium-clad Aluminum-based Inert Composite Anode Materials

In the galvanized zinc industry,lead anode is the main used anode material.This lead anode had many problems,such as low mechanical strength,easy deformation,easy to dissolve the anode,pollution cathode quality.In order to solve these problems,the researchers proposed a variety of solutions,such as:the lead anode to add other metals,the formation of alloys to improve the anodic electrochemical properties;the use of titanium-based PbO2 anode to replace the traditional lead anode.Among them,the study mainly in the titanium-based PbO2 anode,although the titanium-based Pb02 anode has a strong corrosion resistance,excellent catalytic activity,excellent mechanical strength,etc.,but the attendant,it also exists The stress is easy to fall off,the complex process of high cost of preparation problems are also revealed,making it in the application process by a lot of constraints.In this paper,for the existence of titanium-based PbO2 electrode,a rod-like titanium-coated aluminum substrate coated with aluminum as the inner core and titanium tube was prepared and the titanium alloy was tightly bonded by heat treatment.Secondly,the WC modified anode material was prepared on the surface of the substrate by pulsed electrodeposition by adding WC micron modified particles.The rod-shaped titanium-coated aluminum composite anode material was prepared.The structure of titanium-coated aluminum matrix was observed by scanning electron microscopy(SEM).The effects of various preparation conditions on the electrochemical properties of the anodes were investigated by anodic polarization curves and duffel curves.The effects of temperature on the residual stress of the coatings were investigated by X-ray diffraction,Raman spectroscopy and electrochemical impedance spectroscopy.Through the above experimental means,the following results are obtained:The rod-shaped titanium clad aluminum obtained by the annealing heat treatment(putting the rod-shaped titanium aluminum into the muffle furnace,raising the temperature with the furnace to 700?,then keeping the temperature for 1 h.cooling with the furnace to room temperature)Between the layers of metal from the original mechanical combination into a metallurgical combination,the middle layer of material for the TiAl3.The surface morphology of the anode material is not much affected by the titanium alloy aluminum electrodeposition after annealing.However,the deposition potential can be effectively reduced.The optimized results were as follows:Pb(NO3)2 concentration:210 g/L,NaF concentration:0.5 g/L,Cu(NO3)2concentration:25 g/L,The amount of WC added:40 g/L,O-7 concentration:0.5 g/L average pulse current density:31.25 mA/cm2,pulse current duty cycle:30%,pulse current frequency:20 Hz.The oxygen evolution potential of the modified anode material prepared under this process condition is 3.2139 V,which has good electrocatalytic activity.The corrosion resistance is also good.The corrosion current density is 4.94×1O-6 mA/cm2.The addition of WC particles and the pulsed appropriate process conditions can effectively improve the coating morphology and the electrode corrosion resistance and electrocatalytic activity.In the simulated electrodeposited zinc system,WC particles modified anode with higher current efficiency.In the study of the anode failure process,the electrolysis process of the modified anode is divided into three parts:the initial electrolysis,the electrolytic stability period,the electrolysis end.At the initial stage of electrolysis,the surface of the electrode was accompanied by the corrosion of the electrode surface,and the surface of the electrode showed irregularity.The surface of the electrode was stable and the square grain was distributed in the large area.The electrode was further corroded and the regular surface morphology was lost.The results of XRD show that the prepared samples have tensile stress and change the plating temperature.The electrodeposition time can obviously change the stress of PbO2 coating.The addition of WC particles does not change the stress state of the coating obviously.The greater stress will deteriorate the corrosion resistance of the electrode material.Raman spectroscopy analysis showed that the test results were consistent with the results of XRD method,and finally the stress factor was 1052.594 MPa/cm-1,and the stress-free spectral position was X = 519.066 cm-1.