This paper presents new findings about the passive film formed on super duplex stainless steel in ambient air and corrosive environments, studied by synchrotron grazing-incidence X-ray diffraction (GIXRD). The passive film, formed in air, was seen to be a nano-crystalline mixed-oxide. Electrochemical polarisation to the passive region in aqueous 1 M NaCl at room temperature resulted in an increase of the passive film thickness, preferential dissolution of Fe, and partial loss of crystallinity. After termination of polarization to the transpassive regime, reformation of the mixed-oxides was observed, showing a thicker, semi-crystalline, and more defective nature (more vacancies) with further new oxides/hydroxides.

中文翻译：

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腐蚀环境中双相不锈钢钝化膜演化的原位同步加速器 GIXRD 研究

本文介绍了通过同步加速器掠入射 X 射线衍射 (GIXRD) 研究在环境空气和腐蚀环境中在超级双相不锈钢上形成的钝化膜的新发现。在空气中形成的钝化膜被认为是纳米晶体混合氧化物。室温下在 1 M NaCl 水溶液中对钝化区的电化学极化导致钝化膜厚度增加、Fe 优先溶解和结晶度的部分损失。在极化终止到透射状态后，观察到混合氧化物的重新形成，显示出更厚的、半结晶的和更多缺陷的性质（更多的空位）和更多的新氧化物/氢氧化物。