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US 6,284,053 B1Granted
Selective deleading process and bath for plumbing components made of a copper alloy
AssigneeRuvaris S.r.l.
InventorsAngelo Bonomi, Stefano Carrera, Giuliano Franzosi
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Abstract
A process for selectively deleading a plumbing component made of a lead-containing copper alloy. The process comprises traditional pickling the component, washing the component, dipping the component in a deleading bath comprising at least one carboxylic acid selected from the group consisting of formic acid, acrylic acid, propionic acid and butyric acid and traditionally finishing the component.
Claims9
A process for selectively deleading a plumbing component made of a zinc-and-lead-containing copper alloy, the process comprising the following steps in order:
- pickling the component in an acid bath;
- washing the component;
- removing lead and zinc contaminants from the component by treating the zinc-and-lead-containing copper alloy with a deleading bath comprising acrylic acid and a surfactant;
- and
- determining the ratio of removed lead and zinc to be 1.8 by analyzing the deleading bath.
2 more elements
Dependencies are inferred from the claim text.