Process and composition for forming black oxide layers
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United States of America Patent
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Nov 13, 1990
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N/A
app pub date -
Mar 30, 1989
filing date -
Mar 30, 1989
priority date (Note) -
Expired
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Abstract
Black, brown, and red oxide layers having high adhesion and peel strength are formed on printed circuit boards by adding a suitable amphipathic anionic surfactant to standard oxidizing solutions. The oxide layers thus formed result in multilayer circuit boards having reduced tendency to delaminate.
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