Protection of alodine coatings from thermal aging by removable polymer coatings.

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Description

Removable polymer coatings were evaluated as a means to suppress dehydration of Alodine chromate conversion coatings during thermal aging and thereby retain the corrosion protection afforded by Alodine. Two types of polymer coatings were applied to Alodine-treated panels of aluminum alloys 7075-T73 and 6061-T6 that were subsequently aged for 15 to 50 hours at temperatures between 135 F to 200 F. The corrosion resistance of the thermally aged panels was evaluated, after stripping the polymer coatings, by exposure to a standard salt-fog corrosion test and the extent of pitting of the polymer-coated and untreated panels compared. Removable polymer coatings mitigated ... continued below

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29 p.

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Wagstaff, Brett R.; Bradshaw, Robert W. & Whinnery, LeRoy L., Jr. December 1, 2006.

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Description

Removable polymer coatings were evaluated as a means to suppress dehydration of Alodine chromate conversion coatings during thermal aging and thereby retain the corrosion protection afforded by Alodine. Two types of polymer coatings were applied to Alodine-treated panels of aluminum alloys 7075-T73 and 6061-T6 that were subsequently aged for 15 to 50 hours at temperatures between 135 F to 200 F. The corrosion resistance of the thermally aged panels was evaluated, after stripping the polymer coatings, by exposure to a standard salt-fog corrosion test and the extent of pitting of the polymer-coated and untreated panels compared. Removable polymer coatings mitigated the loss of corrosion resistance due to thermal aging experienced by the untreated alloys. An epoxide coating was more effective than a fluorosilicone coating as a dehydration barrier.

Physical Description

29 p.

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  • Report No.: SAND2006-6582
  • Grant Number: AC04-94AL85000
  • DOI: 10.2172/897634 | External Link
  • Office of Scientific & Technical Information Report Number: 897634
  • Archival Resource Key: ark:/67531/metadc890663

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Office of Scientific & Technical Information Technical Reports

Reports, articles and other documents harvested from the Office of Scientific and Technical Information.

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Creation Date

  • December 1, 2006

Added to The UNT Digital Library

  • Sept. 22, 2016, 2:13 a.m.

Description Last Updated

  • July 25, 2017, 9:32 a.m.

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Wagstaff, Brett R.; Bradshaw, Robert W. & Whinnery, LeRoy L., Jr. Protection of alodine coatings from thermal aging by removable polymer coatings., report, December 1, 2006; United States. (digital.library.unt.edu/ark:/67531/metadc890663/: accessed October 18, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.