作者用椭圆偏振法结合交流阻抗法研究了耐海水腐蚀的双相不锈钢05Cr20Ni9Mc4Cu2Si3N在3.5％NaCl溶液中的钝化膜。结果表明:在自腐蚀及恒电位阳极极化(+0.2和+0.6V,vs.Ag/AgCl)条件下所生成的钝化膜都是双层的,但两者的生长机制不同。在自腐蚀状态下,内层吸收膜的折射率为2.5,主要由Fe_2O_3和Cr_2O_3组成;在恒电位下,内层膜是折射率约为1.2左右的吸附膜。两种条件下生成的外层膜,折射率都在1.7左右,主要由FeOOH,CrOOH或Cr(OH)_3组成,且可能具有非晶态结构。在恒电位下内、外层钝化膜的生长都服从对数规律。在自腐蚀状态下,内层膜的生长近似服从对数规律,外层膜的生长则不服从对数规律。
Passive films formed on duplex stainless steel 05Cr20Ni 9Mo4Cu2Si 3N in 3. 5% NaCl solution have been studied by ellipsometry combined with AC impedance measurements. It was found that all passive films formed at open-circuit potential and at various anodic potentials(+0. 2 and+ 0. 6V, vs. Ag/AgCl) have a two layer structure, while their growth mechanisms are different. At open-circuit potential the inner absorbing film with a refractive index of ca. 2. 5 is predominantly composed of Fe_2O_3 and Cr_2O_3. At constant potentials inner layer films are adsorbed-films with a refractive index ofea. 1. 2. Under both conditions the outer layer films with arefraetive index of ca. 1. 7 are predominantly composed of FeOOH, CrOOH or Cr(OH)_3 and have amorphous structure possibly. The kinetics of both inner and outer layer film growth at constant potentials follows logarithmic law. The kinetics of the inner layer film growth at open-circuit potential is approximately logarithmic.
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