Reducing agent for forming an acid resistant barrier
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United States of America Patent
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Nov 2, 1999
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app pub date -
Sep 15, 1997
filing date -
Sep 15, 1997
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Abstract
A composition that enhances the acid resistance of copper oxide. The composition includes a solution of an alkali metal borohydride and a quaternary ammonium ion in amounts selected such that when the composition is applied to copper oxide, the composition enhances the acid resistance of the copper oxide. The preferred alkali metal borohydride is sodium borohydride or potassium borohydride, and the preferred quaternary ammonium ion has the formula ##STR1## wherein each R1, R2, R3, R4 independently comprises a lower alkyl, hydroxylalkyl or carboxyalkyl group.
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