标题：Potentiodynamic and potentiostatic investigation on the passivation of Fe based glassy alloys in alkaline solution
作者：Zhang H.; Yan Z.C.; Shen K.C.; Chen Q.; Zhang L.C.; Li X.Y.; Wang W.M.
作者机构：[Zhang, H] Key Laboratory for Liquid-Solid Structural Evolution and Processing of Materials, Ministry of Education, Shandong University, Jinan, 250061 更多
通讯作者地址：[Wang, W.M] Key Laboratory for Liquid-Solid Structural Evolution and Processing of Materials, Ministry of Education, Shandong University, Qingdao Yunl 更多
来源：Journal of Alloys and Compounds
关键词：Fe-based; Metallic glass; Passivation stability; Potentiostatic test
摘要：The effect of Nb element on the corrosion resistance of Fe-based metallic glasses in the alkaline environment has been investigated with various techniques like potentiodynamic polarization test, scanning electron microscopy (SEM), X-ray photoelectron spectroscopy (XPS), electrochemical impedance spectroscopy (EIS) and potentiostatic tests. With increasing the Nb content, the passivation stability of as spun Fe87-xB13Nbx (x = 0, 7 and 10) glassy ribbons increases and the thickness of their passive film decreases according to XPS analysis. In the potentiostatic test, the ribbons have a transition potential Etrans of −0.58, −0.47 and −0.38 VSCE with x = 0, 7 and 10 respectively, showing an increasing passivation stability with increasing x, which is more sensible than the potentiodynamic parameters like ipass and Epit. Meanwhile, Nb element has the ability to repair pitting holes. In potentiostatic test, the long constant potential treatment below Etrans may enhance the generation of ribbon's passivation film, indicating that the potentiostatic test can tune the passivation behavior of metallic alloys. © 2020 Elsevier B.V.