特超级双相不锈钢S32707在酸化海水中的钝化行为研究
Research on the Passivation Behavior of Hyper Duplex Stainless Steel S32707 in Acidified Seawater Solution
摘要: 本文利用激光共聚焦显微镜、电化学工作站和XPS测试方法，研究了特超级双相不锈钢S32707在酸化海水中的钝化行为，分析了钝化膜的结构和成分。结果表明在酸化海水溶液中，S32707具有约800 mVSCE宽的钝化区，电位升高到900 mVSCE后，试样发生点蚀，点蚀坑位于铁素体和奥氏体相界处，深度大约为1.0 μm。在100 mVSCE和700 mVSCE施加电位下，钝化膜表层贫Ni富N，钝化膜内包含Fe3O4、Fe2O3、Cr2O3、Cr(OH)3、MoO2、NiO氧化物、CrN氮化物及Fe、Cr、Mo、Ni金属单质。提高施加电位，钝化膜厚度减小。
Abstract: The passivation behavior of hyper duplex stainless steel S32707 in acidified seawater solution was investigated by laser-scanning confocal microscopy, electrochemical workstation and XPS method. The structure and composition of the passivation film were analyzed in detail. The result shows that the passive zone width is about 800 mVSCE, and pitting corrosion occurred when the corrosion potential increased to 900 mVSCE. The pitting pit is located at the ferrite and austenite boundary with a depth of about 1.0 μm. Under the applied potential of 100 mVSCE and 700 mVSCE, passive film surface is Ni-depleted and N-rich, and passive film is consisted of Fe2O3, Cr2O3, Cr(OH)3, MoO2, NiO oxides, CrN nitride and Fe, Cr, Mo, Ni metals. In addition, the thickness of the passive film decreases with increasing the applied potential.
文章引用：张彬彬, 张树才, 李志兴, 范思鹏, 常朋飞, 吴敬玺, 冯浩, 姜周华. 特超级双相不锈钢S32707在酸化海水中的钝化行为研究[J]. 冶金工程, 2018, 5(2): 47-54. https://doi.org/10.12677/MEng.2018.52007

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