Copper and zinc elution preventing method of copper-alloy-made plumbing instrument including valve and pipe joint, copper-alloy-made plumbing instrument using the method, and film-forming agent
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United States of America Patent
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Jan 20, 2015
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N/A
app pub date -
Sep 23, 2011
filing date -
Nov 22, 2010
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Abstract
A method is provided for preventing copper and zinc from being eluted from a copper-alloy-made plumbing instrument that includes valves and pipe joints and suppresses copper and zinc from being eluted from the copper-alloy-made plumbing instrument while using for the plumbing instrument copper alloy as-is that includes bronze and brass, to provide a copper-alloy-made plumbing instrument using the method and to provide a film-forming agent. The method forms on at least a liquid-contact portion of the copper-alloy-made plumbing instrument a film of an organic substance comprising unsaturated fatty acid and coating with the film both copper and zinc in the surface layer of the liquid-contact portion of the plumbing instrument, thereby suppressing the elution of copper and zinc.
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