Accession Number : ADA329384

Title :   NDE Method for Characterizing Anodized Al Surfaces

Descriptive Note : Final rept. 1 Sept 77-31 Jul 78

Corporate Author : ROCKWELL INTERNATIONAL CORP THOUSAND OAKS CA SCIENCE CENTER

Personal Author(s) : Smith, T.

PDF Url : ADA329384

Report Date : JAN 1979

Pagination or Media Count : 113

Abstract : This report describes a study of the relationship between nondestructive inspection (NDI) for contaminants on phosphoric acid anodized (PAA) Al 7075-T6 and bond strength and degradation that results from the contamination. Contamination is used in the broad sense to include surface preparation process errors (e.g., incorrect anodize time or voltage) and handling damage, as well as organic contamination from humans and smog. It is demonstrated that the ellisometric technique can adequately reveal contamination at levels below and in the range that significantly degrades bond integrity. The ellisometric technique is not restricted to flat panels, as demonstrated by mapping a panel with 7 cm radius of curvature. However, mapping of curved surfaces would be facilitated by passing the sensor head over the panel rather than the panel under the head. This and mapping on NDI of smaller numbers of various shaped parts requires the development of a small miniaturized hand-held contamination tester. The design of such a tester is presented.

Descriptors :   *NONDESTRUCTIVE TESTING, *ADHESIVE BONDING, ALUMINUM, MAPPING, ELLIPSOMETERS, PHOSPHORIC ACIDS.

Subject Categories : Adhesives, Seals and Binders
      Test Facilities, Equipment and Methods

Distribution Statement : APPROVED FOR PUBLIC RELEASE