Apparatus, methods, and compositions for removing coatings from a metal component
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United States of America Patent
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Sep 11, 2012
Grant Date -
May 14, 2009
app pub date -
Mar 12, 2008
filing date -
Jun 10, 2005
priority date (Note) -
Expired
status (Latency Note)
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Abstract
Apparatus and methods for removing coatings from metal components, such as metal components used in aircraft and other aerospace vehicles and the oil industry, as well as aqueous bath compositions. The metal component may be DC coupled with a counter electrode and immersed in an aqueous bath that includes an active oxygen source and a ligand in a composition effective to remove the coating. The aqueous bath may include hydrogen peroxide as the active oxygen source and may be maintained in a specific pH range if the temperature of the aqueous bath is controlled. In an alternative embodiment, the composition of the aqueous bath may include a non-peroxide active oxygen source, such as sodium perborate, and be maintained in a different specific pH range. An oxygen sensor may be provided to periodically monitor the concentration of active oxygen in the aqueous bath.
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