Abstract
A study was made to characterize by spectroscopic methods the surface of oxides formed on Al 1100 by chromate conversion coating, chromic acid anodizing and sulfuric acid anodizing. Adhesive bond strength to silicone rubber was determined using single lap joint specimens, and correlation between the microscopic structure and macroscopic values was found. It was observed that the layer formed in chromate conversion coating was essentially hydrated chromia, and it yielded the lowest bond strength. Sulfuric acid anodizing produced hydrated alumina, incorporating sulfate ions in its matrix; an intermediate bond strength was found with this pretreatment. Chromic acid anodizing gave rise to a compact, almost anhydrous alumina film, and the highest bond strength was attained.
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