Research On Corrosion Inhibitor Of Magnesium Air Battery Electrolyte

Metal air battery(MAB)is a special type of fuel cell,which has some advantages of low cost,non-toxic,non-polluting,energy and power output efficient.Because of its advantages,it can be widely used as new energy-Magnesium alloy.However,self-corrosion and hydrogen evolution is the main problems for magnesium alloy as the material of magnesium air battery.Accordingly,in order to improve its corrosion resistance resulting in enhancing the storage performance of battery,the composition of magnesium alloy and/or electrolyte should be changed.Therefore,the present paper focuses on the effect of corrosion inhibitor in electrolyte on electrochemical performance of the magnesium air battery and corrosion resistance.Furthermore,the performances of cell battery which is assembled to be portable battery,have been studied by application of the electrochemical impedance spectrum and corrosion inhibitor effect on AZ31 potentiodynamic polarization curve.In the magnesium air battery industry,the polarization and corrosion of the magnesium anode is an important indicator of the measurement of magnesium air batteries.In this paper,a single inhibitor of cerium nitrate(CeN309·6H20),yttrium nitrate(Y(N03)3·6H20),zirconium nitrate(Zr(N03)4·5H20),lanthanum nitrate(La(N03)3·6H20)and neodymium nitrate(Nd(N03)3 6H20)is studied by potentiodynamic polarization method and electrochemical impedance spectroscopy and effect of mixed corrosion inhibitor on corrosion resistance of AZ31 negative electrode.The results show that the addition of corrosion inhibitors such as cerium nitrate hexahydrate,yttrium nitrate,zirconium nitrate,lanthanum nitrate and neodymium nitrate will form protective film on the surface of AZ31 magnesium alloy,improve the corrosion resistance of magnesium alloy,extend battery discharge time,increase its service life.Determination of cerium nitrate hexahydrate,yttrium,zirconium nitrate,lanthanum nitrate and the best concentration of neodymium nitrate is 1.0g/L,4.0g/L,2.5g/L,1.5g/L and 3.5g/L.The corrosion rates calculated by the impedance are respectively 53.88%,48.26%,67.66%,44.39%and 72.71%.Considering the effect of corrosion inhibitors,cerium nitrate,zirconium nitrate and lanthanum nitrate inhibitors are the ideal corrosion inhibitor,and corrosion inhibition is the best.Based on the single corrosion inhibitor,the effect of compound corrosion inhibitor on the corrosion resistance of magnesium air battery was studied.The results show that cerium nitrate and lanthanum nitrate enhances the corrosion resistance of magnesium alloys,increase the corrosion rate,The corrosion rates calculated by the impedance is 78.97%,the corrosion resistance of magnesium alloy works best,extend the life of batteries,the battery discharge time extend nearly 100min.Cerium nitrate and zirconium nitrate and lanthanum nitrate and zirconium nitrate mixture is poor to enhance the corrosion resistance of magnesium alloy.Compared with the single corrosion inhibitor,the corrosion inhibitor is better.