The Corrosion And Electrochemical Behaviors Of Aluminum Anode In Alkaline-ethanol Solution

Aluminum is a very attractive anode material for energy storage and conversion because of its negative standard electrode potential, abundance in nature, low price and high theoretical capacity. However, in neutral solutions, the surface of aluminum tends to form passive film and become inactive. In acid or alkaline solutions, aluminum is an active anode, but undergoes serious self-corrosion with the evolution of large amounts of hydrogen gases. The above problems must be solved for aluminum to be commercially used in batteries. 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. In this paper, we will research it.In this dissertation, the history of the usage of aluminum in electrochemical batteries and the development situation of various kinds of aluminum batteries as well as the additives of the sodium hydroxide ethanol solutions was reviewed. the effects of ethanol on the corrosion and anodic dissolution behaviors of pure aluminum in4mol/L NaOH ethanol-water mixed solutions were investigated. The experimental results indicated that the addition of ethanol greatly inhibited the corrosion of aluminum in the4mol/L NaOH ethanol-water solution, but the discharge of aluminum in4mol/L NaOH ethanol-water was obviously reduced. Then, the effects of Na2SnO3, C4O6H4KNa and CaCl2on the corrosion and anodic dissolution behaviors of pure aluminum in4mol/L NaOH ethanol-water mixed solutions with50%ethanol/water volume ratio were investigated. The experimental results indicated that the addition of stannate greatly inhibited the corrosion of aluminum in the4mol/L NaOH ethanol-water solution by the deposition of tin with a higher hydrogen evolution potential on the electrode surface, and in the electrolytes with higher stannate contents the inhibition effect decreased. In the4mol/L NaOH ethanol-water solution with50%water the electrolyte system with0.01mol/L stannate provided larger inhibition efficiency. The results of galvanostatic discharge showed that the discharge of aluminum in the Na2SnO3-containing4mol/L NaOH ethanol-water solutions was obviously improved, and the improvement effect enhanced with the increase of stannate content. Finally, the effects of Na2Sn03and C4O6H4KNa on the electrochemical behavior of aluminum in the4mol/L NaOH ethanol-water mixed solution with50%water were investigated. The addition of C4O6H4KNa and Na2Sn03could obviously inhibit the corrosion of aluminum in the4mol/L NaOH ethanol-water solution.