A corrosion testing program was undertaken to evaluate the corrosion resistance of anodized/oxygen stabilized films on aluminum substrate. In oxalic acid the oxide layer formation is the self-color type with superior corrosion resistance properties. Two test procedures are discussed that were used to complete the evaluation. These included the Kape test, and
the potential decay test in natural immersion. Electron microscopy was used to identify the attack pattern. In accordance with the test results a corrosion resistance ranking designation was assigned to various surfaces based on electrical and physical process parameters. Finally, a cross-reference was established to correlate the rankings to various atmospheric environments.