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应用电容测试法并借助于点缺陷模型(PDM)计算了2205双相不锈钢与316L奥氏体不锈钢在NaCl溶液中所形成的钝化膜内点缺陷的扩散系数,利用实验测得钝化膜的稳态电流和PDM模型对计算结果进行了验证分析。通过两种计算方法得到点缺陷在2205双相不锈钢与316L奥氏体不锈钢钝化膜内的扩散系数约为10~(-23) cm~2/s～10~(-20)cm~2/s数量级,并发现在模拟海水溶液中2205钢的扩散系数比316L钢小,氧空位所形成的点缺陷在2205钢的钝化膜内比316L钢扩散困难,从而使得2205不锈钢的钝化膜比316L不锈钢更加致密与完整,保护性能更好。
The diffusion coefficients of point defects in passivation films formed by 2205 duplex stainless steel and 316L austenitic stainless steel in NaCl solution were calculated by capacitance test and point defect model (PDM) The steady-state current and PDM model are used to verify and analyze the calculation results. The diffusion coefficient of the point defects obtained in the two kinds of calculation methods in the passivation films of 2205 duplex stainless steel and 316L austenitic stainless steel is about 10 ~ (-23) cm ~ 2 / s ~ 10 ~ (-20) cm ~ 2 / s and found that the diffusion coefficient of 2205 steel is smaller than that of 316L steel in the simulated seawater solution. The point defects formed by oxygen vacancies are more diffusive than 316L steel in the passivation film of 2205 steel, so that the passivation film of 2205 stainless steel is 316L Stainless steel is more dense and complete, better protection.