采用恒电位－恒电流（Ｐ－Ｇ）瞬态响应技术研究了２２０５和３１６Ｌ不锈钢在０．５和１．０ｍｏｌ／ＬＮａＣｌ溶液中钝化膜的结构和稳定性．研究结果证实，体系的钝化膜均具有多层结构．讨论了氯离子在钝化膜生长和破坏过程中的作用．并提出可能的作用模式和破坏机制．由Ｐ－Ｇ响应曲线计算得到的各特征参数随极化电位的变化关系表明，２２０５双相钢在ＮａＣｌ介质中的耐蚀性明显高于３１６Ｌ不锈钢．另外，初步探讨了２２０５钢的组织结构与钝化膜稳定性的关系．
Structure and stability of the passive films on 2205 and 316L stainless steels in the NaCl solution media, 0.5 and 1.0 mol/L, were studied by using the potentiostatic-galvanostatic (P-G) transient technique. A multiple layer structure of the passive films is revealed on both steels. The action model and breakdown mechanism were suggested on the discussion of the Cl- behaviour against growth and breakdown of the passive films on the steels.The polarized potential dependence on the electrochemical parameters may be determined by P-G response curves. The corrosion resistance to NaCl media of 2205 diphase steel is much superior to that of 316L steel. Furthermore. A preliminary discussion of effect of metallographical structure of 2205 diphase steel on the stability and pitting resistance of passive film was made.Correspondent: SONG Shizhe, professor, Department of Materials Science and Engineering, Tianjin University, Tianjin, 300072
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