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Impact of pH on the Corrosion of Novel Metal-Metal Glassy Alloys in Artificial Seawater: An Electrochemical and Morphology Study
Journal of Materials Engineering and Performance ( IF 2.2 ) Pub Date : 2020-01-13 , DOI: 10.1007/s11665-020-04559-6
Khadijah M. Emran , Albandaree K. Al-Harbi

Two novel Fe78Co9Cr10Mo2Al1 and Fe49Co49V2 (at.%) metal-metal glassy alloys were studied in artificial seawater at 27 °C with pH values in the 7.5-8.5 range. The corrosion behavior of both alloys was investigated by using electrochemical techniques such as electrochemical impedance spectroscopy (EIS) and cyclic polarization (CP) measurements as well as physical techniques such as x-ray photoelectron spectroscopy (XPS), scanning electron microscopy (SEM) and atomic force microscopy (AFM). Good agreement between the resistance of both alloys with rising pH values was observed. The high corrosion rate for the VX50 alloy is related to the absence of passivation behavior on the alloy surface. The VX9 alloy shows a low corrosion current density and a low corrosion rate due to the alloying element such as Cr, which enables the formation of a protective film.



中文翻译:

pH对新型金属-金属玻璃合金在人工海水中腐蚀的影响:电化学和形态学研究

两种新颖的Fe 78 Co 9 Cr 10 Mo 2 Al 1和Fe 49 Co 49 V 2(at。%)金属-金属玻璃态合金是在人造海水中于27°C和pH值在7.5-8.5范围内进行研究的。两种合金的腐蚀行为均通过电化学技术(例如电化学阻抗谱(EIS)和循环极化(CP)测量)以及物理技术(例如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)。观察到两种合金的电阻与pH值升高之间的良好一致性。VX50合金的高腐蚀速率与合金表面无钝化行为有关。由于诸如Cr的合金元素,VX9合金表现出低的腐蚀电流密度和低的腐蚀速率,这使得能够形成保护膜。

更新日期:2020-01-13
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