Accession Number : AD0777031

Title :   The Effects of Chromate Conversion Coating Aluminum Stress Corrosion Specimens.

Descriptive Note : Progress rept.,

Corporate Author : NAVAL AIR DEVELOPMENT CENTER WARMINSTER PA AIR VEHICLE TECHNOLOGY DEPT

Personal Author(s) : Shaffer,I. S.

Report Date : 18 MAR 1974

Pagination or Media Count : 16

Abstract : A major problem in assessing stress corrosion susceptibility of 7XXX series aluminum alloys by alternate immersion in a 3.5% NaCl aqueous solution is excessive pitting corrosion. An investigation was initiated to determine if chromate conversion surface treatment would improve the sensitivity of the alternate immersion test by minimizing pitting and gross corrosion. Results of alternate immersion tests of coated and bare 7075 tensile bar and C-ring specimens showed that stress corrosion cracks were easier to detect on chromate conversion coated specimens. (Author)

Descriptors :   *Stress corrosion, *Aluminum alloys, *Chromates, Coatings, Sodium chloride, Test methods, Detection

Subject Categories : Coatings, Colorants and Finishes
      Properties of Metals and Alloys

Distribution Statement : APPROVED FOR PUBLIC RELEASE