Abstract: 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 HNO3 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.

Key words: aluminum lithium alloy, acid environment, pitting corrosion, exfoliation corrosion, cellular automaton

摘要： 为研究储罐材料与液体推进剂的相容性问题，使用电化学试验和全浸试验探究了2195-T8铝锂合金在HNO3中的腐蚀机理，并基于元胞自动机法对其腐蚀历程进行仿真。研究结果表明：合金在质量分数30%的HNO3中的腐蚀最快；腐蚀初期主要发生点蚀，随后逐渐形成剥落腐蚀。拟合的等效电路反映合金在HNO3中的动力学过程，解释了电化学阻抗谱第四象限中出现感抗的现象。元胞自动机模型以Logistic分布概率为腐蚀概率临界条件，所得仿真结果与试验结果相对应。

关键词: 铝锂合金, 酸性环境, 点蚀, 剥蚀, 元胞自动机