National Technical Reports Library

The National Technical Information Service acquires, indexes, abstracts, and archives the largest collection of U.S. government-sponsored technical reports in existence. The NTRL offers online, free and open access to these authenticated government technical reports. Technical reports and documents in its repository may be available online for free either from the issuing federal agency, the U.S. Government Publishing Office’s Federal Digital System website, or through search engines.

Details

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

DE2004770783

Publication Date	2000
Personal Author	Laget, V.; Jeffcoate, C.; Isaacs, H. S.; Buchheit, R. G.
Page Count	18
Abstract	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.
Keywords	Aluminium alloys Thermal stability Aging Protective coatings Chromates Corrosion resistance Stability Materials testing Spectroscopes Heating Degradation Dehydration
Source Agency	Technical Information Center Oak Ridge Tennessee
Corporate Authors	Ohio State Univ., Columbus. Dept. of Materials Science and Engineering.; Brookhaven National Lab., Upton, NY. Dept. of Applied Science.; Department of Energy, Washington, DC.
Supplemental Notes	Prepared in cooperation with Brookhaven National Lab., Upton, NY. Dept. of Applied Science. Sponsored by Department of Energy, Washington, DC.
Document Type	Technical Report
NTIS Issue Number	200512

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

Thermal Stability and Aging Characteristics of Chromate Conversion Coatings on Aluminum Alloy 2024-T3.
DE2004770783

Publication Date	2000
Personal Author	Laget, V.; Jeffcoate, C.; Isaacs, H. S.; Buchheit, R. G.
Page Count	18
Abstract	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.
Keywords	Aluminium alloys Thermal stability Aging Protective coatings Chromates Corrosion resistance Stability Materials testing Spectroscopes Heating Degradation Dehydration
Source Agency	Technical Information Center Oak Ridge Tennessee
Corporate Authors	Ohio State Univ., Columbus. Dept. of Materials Science and Engineering.; Brookhaven National Lab., Upton, NY. Dept. of Applied Science.; Department of Energy, Washington, DC.
Supplemental Notes	Prepared in cooperation with Brookhaven National Lab., Upton, NY. Dept. of Applied Science. Sponsored by Department of Energy, Washington, DC.
Document Type	Technical Report
NTIS Issue Number	200512