Method for exposing and cleaning insulating coats from metal contact surfaces
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United States of America Patent
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Apr 30, 2013
Grant Date -
Jan 20, 2011
app pub date -
Jun 25, 2010
filing date -
Jul 20, 2009
priority date (Note) -
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Abstract
A process flow exposing and cleaning contact surfaces employing a liquid cleaning agent such as flux to penetrate the interface between the glassy coats and the surface of metal and to delaminate the coats from the metal, and then, at elevated temperatures, to use the agent's vapor pressure to break up the glassy coats into smaller pieces. The glassy coats are prevented by their low density to penetrate into the molten solder. Finally, at ambient temperature, the floating filler debris is water-washed and rinsed away. Cleaning agents include low-viscosity liquids (oils) and flux, which do not decompose at elevated temperatures and are mixed with components operable to provide, at the elevated temperatures, the fumes for sufficient vapor pressure to break up and dislodge the coats from the metal contacts.
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