US2015129088A1PendingUtilityA1

Gaseous sulfur treatment methods for copper zinc alloys

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Assignee: NIBCOPriority: Apr 25, 2011Filed: Jan 20, 2015Published: May 14, 2015
Est. expiryApr 25, 2031(~4.7 yrs left)· nominal 20-yr term from priority
Inventors:Benjamin L. Lawrence
C23C 8/08C22C 9/04C23C 8/40C23C 8/42
56
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Claims

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.

Claims

exact text as granted — not AI-modified
The invention claimed is: 
     
         1 . A method of making a corrosion resistant brass component, comprising:
 contacting surfaces of a finished brass component with a gaseous atmosphere containing labile sulfur,   wherein 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, and   further wherein 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.   
     
     
         2 . The method of  claim 1 , wherein the elevated temperature is from 500° F. to 1500° F. 
     
     
         3 . The method of  claim 1 , wherein the elevated temperature is from 1100° F. to 1400° F. 
     
     
         4 . The method of  claim 1 , wherein the elevated temperature is from 1150° F. to 1350° F. 
     
     
         5 . The method of  claim 2 , wherein the time is from about 15 minutes to 1 hour. 
     
     
         6 . The method of  claim 1 , wherein the finished brass component comprises lead from about 0.05% to 0.25% by weight. 
     
     
         7 . The method of  claim 6 , wherein the metal-sulfide rich layer comprises lead sulfide. 
     
     
         8 . The method of  claim 1 , wherein the finished brass component comprises at least one of arsenic, antimony and phosphorous from about 0.05% to 0.15% by weight. 
     
     
         9 . The method of  claim 1 , wherein the gaseous atmosphere containing labile sulfur is substantially oxygen-free. 
     
     
         10 . The method of  claim 1 , wherein the metal-sulfide rich layer is from about 9 microns to 12 microns in thickness. 
     
     
         11 . A method of making a corrosion resistant brass component, comprising:
 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,   wherein 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, and   further wherein 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.   
     
     
         12 . The method of  claim 11 , wherein the elevated temperature is from 500° F. to 1500° F. 
     
     
         13 . The method of  claim 11 , wherein the elevated temperature is from 1100° F. to 1400° F. 
     
     
         14 . The method of  claim 11 , wherein the elevated temperature is from 1150° F. to 1350° F. 
     
     
         15 . The method of  claim 12 , wherein the time is from about 15 minutes to 1 hour. 
     
     
         16 . The method of  claim 11 , wherein the finished brass component comprises lead from about 0.05% to 0.25% by weight. 
     
     
         17 . The method of  claim 16 , wherein the metal-sulfide rich layer comprises lead sulfide. 
     
     
         18 . The method of  claim 11 , wherein the finished brass component comprises at least one of arsenic, antimony and phosphorous from about 0.05% to 0.15% by weight. 
     
     
         19 . The method of  claim 11 , wherein the gaseous atmosphere containing labile sulfur is substantially oxygen-free. 
     
     
         20 . The method of  claim 11 , wherein the metal-sulfide rich layer is from about 9 microns to 12 microns in thickness.

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