Open AccessPassivation of chromium disilicide in acidic media
Author(s) -
К. В. Шадрин,
AUTHOR_ID,
В В Пантелеева,
А. B. Shein,
AUTHOR_ID,
AUTHOR_ID
Publication year - 2021
Publication title -
vestnik permskogo universiteta. seriâ himiâ
Language(s) - English
Resource type - Journals
ISSN - 2223-1838
DOI - 10.17072/2223-1838-2021-3-202-211
Subject(s) - passivation , chromium , oxide , materials science , anodizing , electrolyte , polarization (electrochemistry) , corrosion , metallurgy , inorganic chemistry , electrode , chemistry , layer (electronics) , aluminium , composite material
The anodic behavior of CrSi2 electrode in 0,5 M H2SO4, 0,5 M HClO4, 0,5 M HNO3 and 0,5 M HCl solutions has been studied by the methods of polarization, capacitance, and impedance measurements. It has been concluded that in the process of anodic oxidation at potentials from corrosion E to transpassivation E inclusive, an oxide film is formed on the surface of chromium disilicide in the studied media, which is close in composition to SiO2 (with a small content of chromium oxides). The presence of this film on the silicide surface determines its high chemical resistance in the studied solutions. The thickness of the oxide film on CrSi2 has been calculated depending on the potential and composition of the electrolyte. The growth constant of the oxide film has been determined.