Determination of Barrier Layer Thickness of Anodic Oxide Coatings

Abstract

A novel method is described for measuring the thickness of a barrier type anodic oxide coating or the barrier layer portion of a porous type anodic oxide coating. This method is used to follow the evolution of the barrier layer during the early stages of the formation of a porous type coating on aluminum and to establish certain dimensions of the fundamental oxide cells which comprise this type of coating.