Method for treating brass
Number of patents in Portfolio can not be more than 2000
United States of America Patent
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-
Aug 13, 2002
Issued Date -
N/A
app pub date -
Feb 28, 2001
filing date -
Aug 31, 2000
priority date (Note) -
Expired
status (Latency Note)
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Abstract
Brass articles having leachable lead are contacted with an aqueous caustic solution having a pH of about 10 to about 14 that contains a chelating agent. During contact, the brass articles can be sonicated. The brass articles can be optionally pretreated by contacting them with an aqueous solution containing an organic carboxylic acid and an inorganic per-salt. The brass article can optionally further be post treated by contacting them with an aqueous solution containing sodium persulfate.
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