The Effect Of RE On The Electrodeposition, Electroless Deposition Rules And Properties Of Ni Basic Alloy For Function Materials

Hydrogen evolution is significant to apply to electrochemical energy exchange,electrochemical industry,metallic corrosion and protection ,and metal electrodeposition.The cheap electrode materials with good hydrogen evolution catalytic performance can long electrode cyclic life,save energy,improve profit.So it is very important to research on the cathodic materials of high electrocatalytic activity.lt was much reported that hydrogen evolution catalytic performance of metal,alloy and metallic basic composite electrode was studied.But it was little reported that the rare earth could improve the electrocatalytic activity of nickel basic alloy electrode.In this paper,low hydrogen overoltage polybasic alloy electrodes,Ni-Co and Ni-Co-P were prepared respectively by electroplating and electroless plating method,and the effect of rare earth on their physical and chemical properties was studied.The main experiments and their results are as following:1. The 4-facter and 3-level orthogonal experiment was designed to determine the optimal plating conditions of bright Ni-Co alloy containing Co less than 40% from a sulfate bath.Mechanism of electrodeposition and effect of RE on electrodepositing process were investigated.The results showed that the process of Ni-Co alloy belonged to "anomalous codeposition", and rare earth additives decreased the cathodic polarization.The experiment of the effect of the factors([Co2+], pH,Current density,etc.)on the Co content presented that the Co content increased significantly with increasing [Co2+] and temperature,but with decreasing current density and pH.And stiring was good to increase Co content.The component,sulface structure,hardness test,porosity test of the alloy were measured,the results indicated that rare earth additives could improve the mechanical performance and anticorrosion capabilities,but no RE in plating. 2.The electrochemical behaviors of Ni-Co and Ni-Co(RE) were studied in 7M KOHsolution as cathode electrode by means of polarization curves,CV,E-logi curves and kinetic parameters of hydrogen evolution and the results showed that Ni-Co(RE) was proved with good hydrogen evolution catalytic performance and electrochemical stablity,compared with Ni-Co alloy electrode. 3.Ni-Co-P and Ni-Co-P(RE) alloys were electroless deposited on the ferrous basic body with own complexant in weak acid system. The effect of rare earth Ce on Ni-Co-P alloy elecroless technology,the performance of plating,depositing rate and bath properties was studied.The results showed RE could increase the solution stability and depositing rate,so we could have the optimal technology.The component,alloy morphology,sulface structure,porosity test of the alloy were measured,the results indicated that rare earth additives Ce could improve the corrosion resistance,and electroless deposition Ni-Co-P and Ni-Co-P(RE) alloys were amorphous,but no RE in plating.4. The electrochemical behaviors of Ni-Co-P and Ni-Co-P(RE) were studied in 7M KOH solution as cathodic electrode by means of polarization curves,CV,E-logi curves and kinetic parameters of hydrogen evolution ,etc.The results showed that Ni-Co-P(RE) was proved with good hydrogen evolution catalytic performance and electrochemical stablity,compared with Ni-Co -P alloy electrode.