Abstract
Chromium amalgams of varying concentrations were oxidized anodically, galvanostatically and potentiodynamically in 0.1, 1.0 and 1.5 N oxalic acid solutions at 25°C. For the galvanostatic measurements a number of constant polarizing currents were used. The oxidation curves showed regions for the charging of the anodic double layer, the dissolution of chromium as Cr 2+, Cr 3+, formation of the tri-oxalate chromium complex, then mercurous oxalate before oxygen evolution. The relation between the current, i, and time of passivation, T, was found to follow the following reaction: logτ = A − n log i , where A and n are constants. The results indicate that the passivation of chromium amalgams in oxalic solutions can be considered as coulombic in nature.
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