Corrosion Behavior of Aluminum Lithium Alloys in Acidic Environment and Cellular Automata Simulation.

In order to study compatibility of tank materials and liquid propellants, electrochemical tests and full immersion tests were utilized to explore the corrosion mechanism of 2195-T8 aluminum lithium alloys in HNO₃, and the corrosion process was simulated based on cellular automata method. The results show that the alloy has the fastest corrosion rate in HNOj whose mass fraction is as 30%; pitting corrosion occurs in the early stage of corrosion, and then gradually forms exfoliation corrosion. The fitted equivalent circuit reflects the dynamic processes of the alloys in HNO₃ and explains the phenomenon of inductive reactance in the fourth quadrant of electrochemical impedance spectroscopy. Cellular automata model adopted Logistic distribution probability as critical condition of corrosion probability, and the simulation results correspond to that of the tests. [ABSTRACT FROM AUTHOR]