【摘要】 在氧化膜（或钝化膜）自修复和金属自催化溶解的物理模型基础上建立了金属溶解电流的数学模型。应用突变论对此模型进行的分析表明：在临界电位以下，模型具有稳定的定态０解，系统是的涨落启动的溶解电流随时间的延长而平息。在临界电位以上：，模型的定态０解失稳，突变为稳定的作０定态解，系统行为发生突变，在涨落的启动下发生不能平息的溶解，点蚀便萌生了。更多还原

【Abstract】 Based on the physical model that an oxide or a passive film is self-repaired and metal dissolves self-catalytically,a mathematical model for metal’s dissolution current is set up.By application of the catastrophe theory to this model, it is revealed that below a critical potential the model has a stable 0 steady solution.Thus,any dissolution current initiated by fluctuation in the system will decay to 0 with time.The system possesses stable passivation. Above the critical potential.however.the 0 steady solution losses its stability and turns to a stable non-0 steady solutioll.As a result,electrochemical behavior of the system changes drastically.Any dissolution current initiated by the fluctuation will decay no longer.Then, pitting is initiated.更多还原