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Surface Chemistry and Semiconducting Properties of Passive Film and Corrosion Resistance of Annealed Surgical Stainless Steel
Journal of Materials Engineering and Performance ( IF 2.3 ) Pub Date : 2020-09-01 , DOI: 10.1007/s11665-020-05067-3
Rodrigo Kenji de Oliveira , Olandir Vercino Correa , Mara Cristina Lopes de Oliveira , Renato Altobelli Antunes

ASTM F-139 surgical stainless steel was subjected to annealing treatments at 700 °C for different times. The effect of annealing on the chemical composition of the passive film was evaluated by x-ray photoelectron spectroscopy. The correlation of the surface chemistry with the corrosion behavior and semiconducting properties of the passive film was also investigated. Potentiodynamic polarization tests were conducted in phosphate-buffered solution at 37°C. The semiconducting character of the passive film was assessed by the Mott–Schottky approach. The microstructure of the annealed samples was characterized by optical microscopy. The grain size increased after annealing, but the differences between each annealing condition were not significant and could not be associated with the corrosion behavior of the annealed samples. The corrosion resistance was improved depending on the heat treatment condition due to compositional changes of the passive film upon annealing. The best corrosion properties were observed after annealing for 8 h which was ascribed to Cr2O3, MoO3 and FeO enrichment in the passive film.



中文翻译:

退火不锈钢的钝化膜的表面化学和半导体性能以及耐蚀性

ASTM F-139外科用不锈钢在700°C下进行了不同时间的退火处理。通过X射线光电子能谱评价了退火对钝化膜的化学组成的影响。还研究了表面化学性质与钝化膜的腐蚀行为和半导体性质之间的关系。在37℃的磷酸盐缓冲溶液中进行电位动力学极化试验。通过Mott–Schottky方法评估了无源薄膜的半导体特性。通过光学显微镜表征退火样品的微观结构。退火后晶粒尺寸增加,但是每种退火条件之间的差异并不明显,并且与退火样品的腐蚀行为无关。由于退火后钝化膜的成分变化,取决于热处理条件,提高了耐腐蚀性。归因于Cr,退火8 h后观察到最佳腐蚀性能钝化膜中2 O 3,MoO 3和FeO富集。

更新日期:2020-09-02
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