The Magnetic Field Of Solidification Microstructure And Electrochemical Properties Of Low-antimony Lead Alloys Of Rare Earth

Lead-acid batteries were applied widely with some advantages, suchas good reversibility, smooth voltage characteristic, long life span, wideapplications, abundant raw materials, lower cost and high rate ofregeneration. The properties of lead-acid batteries were improvedcontinuously. The lead-acid batteries were used to being second batteriesfor communications, traffic and electric power system at present. Furtherdevelopment of electric vehicle, the batteries changed from 12V/14Vsystem to 36V/42V system automobile. Strong jump-start capacitycombined with endures deeply charge and discharge capacity. Lead-acidbatteries are most applicable at present. Energy density and circular life,ensure dependability of VRLAB should be improved and new appliedfields be exploited.Development actuality, evolution and the main problem of lead-acidbatteries, positive grid and lead low-antimony alloy additive have beenbriefly introduced in this paper. The effect of solidification on themicrostructure of Pb-Sb-Ce alloy in magnetic field was observed bymeans of Photomicrograph, SEM and XPS. The effect of solidification onthe mechanical properties of Pb-Sb-Ce alloy in magnetic field wasresearched in virtue of testing alloys' micro-hardness. The effect ofsolidification on the electrochemistry properties of Pb-Sb-Ce alloy inmagnetic field was investigated by using cyclic voltammetry, EIS, A.C.voltammetry, linear sweep voltammetry and chronopotentiometry. Andeffect of solidification on the corrosion resistance of Pb-Sb-Ce alloy inmagnetic field was studied. The effect of solidification on the hydrogenevolution properties of Pb-Sb-Ce alloy in magnetic field was researchedby means of cathodic polarization curve. The results are shown asfollows.The crystal grain, uniformise grain and thin the grain boundarydiminished by Addition of alternative magnetic field on solidification ofPb-Sb-Ce alloy. The alloy's hardness, improve mechanical properties ofalloy were enhanced by the solidification in alternative magnetic field, theformation of nonstoichiometry lead oxide with poor conductance inanode corrosion film restrained, and the reduction potential of PbSO₄·PbO and PbO and the content of the Pb (Ⅱ) with high impedancein anode corrosion film reduced, and the conductivity of the anodecorrosion film improved; the reduction of PbO₂ in the anode corrosionfilm was restrained by the solidification in alternative magnetic field, andPbSO₄ easily oxidized to PbO₂ with high conductivity, and theconductivity of the anode corrosion film was improved. Inactivation ofthe anode corrosion film, and improves the reversibility of anode reactionof alloy were reduced by improving the conductivity of anode corrosionfilm. Overpotential of hydrogen evolution and water loss were reduced byimproving the solidification in alternative magnetic field.