Thermodynamic data as well as physical and electrochemical studies demonstrate that the composition of the passive layer on chromium depends on the potential and the electrolyte pH. The electrochemical properties of Cr203 electrodes were compared with the anodic behavior of chromium in borate buffer solutions. The feasibility of the solid-phase transformation of a surface layer under anodic polarization was investigated. The conductivity type and deviation from the stoichiometric composition of the chromium oxide was determined in situ using the photopolarization method. Depending
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