Thermal Stability and Aging Characteristics of Chromate Conversion Coatings on Aluminum Alloy 2024-T3

Conference · Sun Oct 17 00:00:00 EDT 1999

OSTI ID:770783

Laget, V; Jeffcoate, C; Isaacs, H S; Buchheit, R G

XANES and electrochemical impedance spectroscopes were used in parallel to correlate the amount of Cr(VI) in chromate conversion coatings (CCC) on Al 2024 and their corrosion resistance in order to understand the degradation mechanisms upon aging or heating. Cr(VI) species appear to be immobilized for temperatures higher than 80 C due to dehydration. CCC are shown to be dynamic in the first month of aging with no significant dehydration. Another degradation mechanism involving chemical changes is to be considered.

• Research Organization: Brookhaven National Lab. (BNL), Upton, NY (United States)
• Sponsoring Organization: USDOE Office of Energy Research (ER) (US)
• DOE Contract Number: AC02-98CH10886
• OSTI ID: 770783
• Report Number(s): BNL-67060; R&D Project: AS-010-MSD; KC-02-01-02; TRN: US200432%%258
• Resource Relation: Conference: 196. Meeting of the Electrochemical Society, Honolulu, HI (US), 10/17/1999--10/22/1999; Other Information: PBD: 17 Oct 1999
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
AGING
ALUMINIUM BASE ALLOYS
CHROMATES
PROTECTIVE COATINGS
CORROSION RESISTANCE
STABILITY
MATERIALS TESTING