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Oxidation kinetics of 304L stainless steel in hot concentrated nitric Acid

机译：304L不锈钢氧化动力学在热浓硝酸中的氧化动力学

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The oxidation kinetics of 304L stainless steel (SS) was studied in hot and concentrated nitric acid solution. The investigations were performed with long term potentiostatic experiments in the passive domain allowing different parameters to be characterized as a function of time. The metal dissolution was determined via weight loss and via solution analyses with inductively coupled plasma atomic emission spectroscopy (ICP-AES). Corrosion morphology was observed by optical microscopy and surface composition (oxide layer and underlying metallic layer) was characterized by X-ray photoelectron spectroscopy (XPS). The oxide layer thickness was independently estimated from electrochemical impedance spectroscopy (EIS) measurements. During the first 50 hours of polarization, the passive film properties together with the metal dissolution rate evolve. Then an apparent steady-state establishes with a low and constant dissolution rate (15 μm/year). It was also shown that the metallic species dissolve uniformly and that a uniform nanometer oxide layer enriched in chromium forms. A Ni enriched underlying metallic film is also observed, the chemical composition of which seems to be not uniform in the whole surface of the SS.
机译：在热浓硝酸溶液中研究了304L不锈钢（SS）的氧化动力学。在被动结构域中的长期电位实验进行研究，允许不同的参数表征为时间的函数。通过重量损失和具有电感耦合等离子体原子发射光谱（ICP-AES）的溶液分析确定金属溶解。通过光学显微镜和表面组合物（氧化物层和下面的金属层）观察腐蚀形态，其特征在于X射线光电子谱（XPS）。从电化学阻抗光谱（EIS）测量的独立估计氧化物层厚度。在偏振的前50小时期间，无源膜性能与金属溶解速率一起进化。然后，表观稳态建立，具有低且恒定的溶解速率（15μm/年）。还表明金属物质均匀溶解，并且富含铬形式的均匀纳米氧化物层。还观察到富含富含金属膜的Ni，其化学组合物在SS的整个表面中似乎不均匀。

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