Mechanism of residual stresses generated in anodic oxidized film on lead alloy substrate was investigated using CrO3 solution with the influence of electric field. The stresses formation process, their relationship with surface morphology and structure of oxidation film were discussed in details based on the results of SEM, XRD and Raman tests. It is indicated that Cr2O72-and HCrO4-ions are absorbed on lead alloy surface in the initial formation process of oxidation film.Then PbCrO4 is formed on the interfa...