Research On Electrochemical Performance Of Aluminum Zinc Series Alloys

Aluminum has more negative potential, higher capacitance, cheaper price, and the development of aluminum as sacrificial anode and anode of the aluminum/air battery very rapid. A lay of dense high resistance oxidize membrane can generate on the Aluminum surface in neutral medium, this lead to the. Adding activity element such as zinc and indium in aluminum, thus aluminum zinc series alloy melted, solves the problem of passivation of aluminum, but the effect of the elements need to be researched further. According to dynamics of coupled sacrificial anode with carbon steel, the integral of galvanic current vs. time approximately equal to actual current capacity of sacrificial anode. Galvanic current of aluminum alloy sacrificial anode coupled with carbon steel are tested, in 3%NaCl solution. Evaluation the performance of sacrificial anode of surface rapidly using galvanic current is feasibility, can be used to get the best sacrificial anode among a series anodes. Using the above method to select the best oil-proof sacrificial anode through a series anodes of same group according to orthogonal design, the ingredient of the anode is Al3Zn0.01Ga0.6Sn0.9Bi, the open circuit potential of anode is -1.095~-1.112V(vs. SCE), operation potential is -1.020~-1.089V(vs. SCE), coulombic efficiency is 97.1%, galvanic capacitance is 2845 A.h.kg-1 on mineral oil adsorbed surface. Galvanic corrosion of aluminum zinc alloy coupled with carbon steel is systemic studied, in 3.5% salt water. The result shows that the influence order of added element to integral of galvanic current vs. time QIgt of aluminum zinc alloy is the first tin, second, indium third, gallium, and the next, bismuth last zinc. Electrochemical impedance spectroscopy (EIS) of alloy was tested at different polarization potential, the characteristic of EIS is investigated .The mechanism of added element zinc, indium and tin activation aluminum alloy replenished, put forward the mechanism of gallium and bismuth cremation aluminum alloy on the foundation of dissolve re-sediment theory, study the role that added element. The result shows that the ion of indium, gallium and bismuth that alloy dissolves generation can wear thorough sampling surface adhere oil membrane, the ion of zinc and tin that dissolves generation can not.