Effects Of Electrolytic Composition On The Performance Of Al Alloy Anode

The aluminum battery series has been greatly concerned because of its high specific energy. High-capability aluminum anode, however, has not been widely used mostly due to its self-corrosion and passivation which make the properties of alkaline battery difficult to satisfy the practical use .Therefore ,it would be of important theoretical significance and practical value to study the mechanism of aluminum anode and the effect of various additives on the electrochemical properties of aluminum anode in alkaline solution.The effect on the performance of aluminum alloy anode in the electrolyte system of 4mol·L^-1NaOH+3mol·L^-1 NaAlO₂ which was mixed with some kinds of additives has been studied. The self-corrosion rate and electrochemical performance has been tested in the electrolyte system in which was added with Na₂SnO₃,In(OH)₃ or the mixture of Na₂SnO₃ and In(OH)₃,The influence of temperature on the self-corrosion rate and electrochemical performance of aluminum alloy anode has been tested by changing the temperature of the electrolyte system ,and testing the influence on the viscosity of basic electrolyte system by changing the concentration of NaF ,and testing the self-corrosion rate and electrochemical performances of aluminum alloy anode by changing the concentration of Na₂SnO₃ and In(OH)₃ to get a optimum concentration of the additive. The self-corrosion rate of aluminum alloy anode has been studied by means of gas drainage .The viscosity of the electrolyte system has been measured by the NXS-11A stirring viscosimeter .The electrochemical performances of aluminum alloy anode has been tested by the CHI-660A electrochemistry station. The results show that Na₂SnO₃ and In(OH)₃ can form a netlike cover on the surface of the aluminum alloy anode which greatly prevents the self-corrosion. In other words, it works as corrosion inhibitor of this system .We can draw a conclusion that the influence of Na₂SnO₃ and In(OH)₃ on the electrochemical performances of aluminum alloy anode is little ,and ,the influence of NaF on the viscosity of the electrolyte system is little as well.