On the Structure of Chromium Oxide Film on the Surface of Tinplate

Abstract

The structure of passivated film on electrolytic tinplate by a cathodic treatment in a dichromate solution has been investigated by anodic potential measurement and Auger-electron spectroscopy.
According to the analysis of the peak shifts between three peaks of chromium observed in Auger-electron spectrum, the passivated film substantially consists of chromium oxide. Further, a new interpretation to estimate the hydration degree of chromium oxide by analysis of chemical effect of the spectrum was proposed.