Abstract
The hardness of the anodic oxide film that forms on aluminum is several times harder than the aluminum base metal. Sometimes this phenomenon causes problems when the limit PV value is too low in friction and wear of the anodized coating.
In this study we attempted to clarify the relationship between the hardness of the anodic oxide film and that of the aluminum base metal using a compression test that simulated the state of a large P value in friction and wear.
The following results were obtained:
(1) Anodic oxide film in which cracks occured in the first step of the compression test was buried into the aluminum base metal in accordance with the magnitude of the compressive weight.
(2) Both the anodic oxide film and the aluminum base metal were hardened in the compression test.
(3) When the aluminum base metal was hard, there was little burying of the anodic oxide film. This means that a large limit PV value, and in particular a large P value, may be obtained in friction and wear.
