PLATING SOLUTION FOR THREADED CONNECTION FOR PIPE OR TUBE AND PRODUCING METHOD OF THREADED CONNECTION FOR PIPE OR TUBE
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United States of America Patent
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Feb 23, 2017
app pub date -
May 15, 2015
filing date -
May 15, 2014
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Abstract
Provided is a plating solution for a threaded connection for pipe or tube used for forming a plating film excellent in galling resistance, crevice corrosion resistance, and exposure corrosion resistance. The plating solution for a threaded connection for pipe or tube of the present embodiment contains no cyanide, but contains: a water-soluble copper salt; a water-soluble tin salt; a water-soluble bismuth salt; a free acid; and a thiourea-based compound of 10 g/L or less (excluding 0) that is represented by Chemical Formula (1):
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