The Research Of Corrosion Electrochemical Behavior And Inhibitors Of Aluminium Anodes In 3.5% NaCl Solution

Aluminum-air fuel battery is a new kind of high energy chemical power,due to its high energy density, abundance in nature, no pollution,low price,long life.In recent years, there are more and more needs of the safe and convenient power for frequent ocean exploiture, especially in the fields of the petroleum and natural gas mine in the sea and sub-sea applications.So briny aluminum-air fuel cell seems to be promising in the future.Though there are lots of advantage of the briny aluminum-air fuel battery, aluminum anode has a short life because of its self-corrosion and the corrosion of Cl- in the sea. This topic launches under this background..This dissertation uses aluminum anode of the aluminum air battery as the research object, studies the corrosion of electrochemcal behavior and the rare earth inhibitor CeCl3 of the aluminum anode from three points of views: the influence factors of the aluminum anode discharge in 3.5% NaCl solution.The rare earth CeCl3 was chosen as the inhibitor of aluminum anode by the curve of potential-time(ET).The discharge performance of aluminum anode was studied by the EIS from there points of view: the inhibitor concentration, the electrolyte temperature and the pH of electrolyte containing CeCl3.The optimum discharge conditions of aluminum anode were determined as: the rare earth inhibitor concentration of CeCl3 is 500mg/L, the electrolyte temperature is 30℃, the pH of electrolyte containing CeCl3 is 5~6. In the discharge curve it showed that the discharge performance of aluminum anode in3.5%NaCl with inhibitor was better than in the blank 3.5% NaCl solution.The dissolution curve of aluminum anode was investigated by the strong area of the Tafel curve.With the help of different the equivalent circuit of EIS, the pit corrosion mechanism was studied in the excessively passive section of aluminum anode,expatiate the reason why the variety of dissolution current density is nonlinear in the passivation section of aluminum anode, at the same time explain that the third apex in Bade represent aluminum cathode. It also found that the stable existent condition of aluminum anode passive film is pH 5~6 in 3.5% NaCl solution. In the end, the author got the conclusion that the...