GASEOUS SULFUR TREATMENT METHODS FOR COPPER ZINC ALLOYS
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United States of America Patent
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May 14, 2015
app pub date -
Jan 20, 2015
filing date -
Apr 25, 2011
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Abstract
A method of making a corrosion resistant brass component that includes the steps: forming a gaseous atmosphere containing labile sulfur by combustion of potassium bisulfate or hydrogen sulfide; and contacting surfaces of a finished brass component with the gaseous atmosphere containing labile sulfur. The surfaces of the brass component are contacted with the gaseous atmosphere at an elevated temperature for a time sufficient to form a metal-sulfide rich layer of at least 5 microns in thickness. Further, the brass component is corrosion resistant after the contacting step as determined by standardized testing that yields dezincification penetration of less than 200 microns in depth.
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