Proceedings of the Shevchenko Scientific Society Series Сhemical sciences, Год журнала: 2024, Номер 2024(75), С. 7 - 16
Опубликована: Окт. 4, 2024
Amorphous metal alloys (AMА) based on cobalt are promising materials with near-zero magnetostriction. In recent years, AMА have been used as sensors and biomaterials for the internal transport of drugs, mainly oncological diseases. Therefore, it is necessary to investigate in detail processes their dissolution passivation aggressive environments, particular, a 3% aqueous solution NaCl, which solubility oxygen greatest. It build up homogeneous oxide-hydroxide film AMC, would be substrate organic immobilizers medical preparations. these subject corrosion due loose defective protective layers formed surface. The purpose work was study phase separation boundary amorphous electrode Co75.5Fe4.6Si6.0B16.7/NaCl by electrochemical impedance spectroscopy determine thickness oxide/hydroxide layers. By potentiometric cyclic voltametry methods corrosive metallic Co75.5Fe4.6Si6.0B16.7 / aqua NaCl interface has investigated. shown that contribute appreciable 2.510–3 % KMnO4 addition promote significant what marked Еcorr. shift anodic side icorr. shows about 10–7 А/cm2 value. surface AMA electrode, during polarization at –290 –550 mV potentials before after 12 hours preimmersion this well were studied means method. model equivalent electric circuits (passivity layer) system fitted. shown, potential consist ox/red reaction resistance oxide layer capacitance. low parameters protection condition relating multiplayer structure, consists thin compact inside more porous outside one, confirmed SEM results.
Язык: Английский
