Emran Khadijah M, Al-Harbi Albandaree K
Chemistry Department, College of Science, Taibah University, Al-Madinah Al-Monawarah, Saudi Arabia.
PLoS One. 2018 Jan 16;13(1):e0187567. doi: 10.1371/journal.pone.0187567. eCollection 2018.
The electrochemical behavior of the oxide layers on two metal-metal glassy alloys, Fe78Co9Cr10Mo2Al1 (VX9)and Fe49Co49V2 (VX50) (at.%), were studied using electrochemical techniques including electrochemical frequency modulation (EFM), electrochemical impedance spectroscopy (EIS) and cyclic polarization (CP) measurements. The morphology and composition of the alloy surfaces were investigated using X-ray photoelectron spectroscopy (XPS), scanning electron microscopy (SEM) and atomic force microscopy (AFM). The corrosion rate and surface roughness of both alloys increased as the concentration of NaOH in aqueous solution was raised. The presence of some protective elements in the composition of the alloys led to the formation of a spontaneous passive layer on the alloy surface. The higher resistance values of both alloys were associated with the magnitude of the dielectric properties of the passive films formed on their surfaces. Both alloys are classified as having outstanding resistance to corrosion, which results from the formation of a passive film that acts as an efficient barrier to corrosion in alkaline solution.
利用包括电化学频率调制（EFM）、电化学阻抗谱（EIS）和循环极化（CP）测量在内的电化学技术，研究了两种金属 - 金属玻璃合金Fe78Co9Cr10Mo2Al1（VX9）和Fe49Co49V2（VX50）（原子百分比）上氧化层的电化学行为。使用X射线光电子能谱（XPS）、扫描电子显微镜（SEM）和原子力显微镜（AFM）研究了合金表面的形貌和成分。随着水溶液中NaOH浓度的升高，两种合金的腐蚀速率和表面粗糙度均增加。合金成分中某些保护元素的存在导致在合金表面形成自发钝化层。两种合金较高的电阻值与在其表面形成的钝化膜的介电性能大小有关。两种合金均被归类为具有出色的耐腐蚀性，这是由于形成了一种钝化膜，该钝化膜在碱性溶液中作为有效的腐蚀屏障。
