Process for the inhibition of leaching of lead from brass alloy plumbing fixtures
OwnerShelley L. Joeinventor
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Abstract
The invention relates to a process for the inhibition and leaching of lead from brass alloy plumbing fixtures including the step of contacting the brass alloy plumbing fixtures with an aqueous nitric acid solution. The aqueous nitric acid solution containing inhibitors selected from the group of block copolymers of propylene oxide and ethylene oxide, fluorocarbon surfactant, polyethylene glycols, and polyols. The aqueous nitric acid solution further contains iron-III chloride.
Claims14
Process for the removal and inhibition of leaching of lead contained within the brass material of plumbing fixtures, by immersing the brass plumbing fixtures in an aqueous leaching solution for sufficient time to remove lead, the aqueous leaching solution contains nitric acid and one or several inhibitors selected from the group of block copolymers of polyethylene glycols, propylene oxide and ethylene oxide, fluorocarbon surfactants, and polyols.
The process for the removal and inhibition of lead contained within the brass surface of plumbing fixtures, by contacting the brass surface of the plumbing fixtures with an aqueous leaching solution, said aqueous leaching solution being characterized in that the leaching solution contains nitric acid and one or several inhibitors selected from the group of block copolymers or propylene oxide and ethylene oxide, fluorocarbon surfactants, polyethylene glycols, and polyols with a molecular weight of more than 2000.
Process for the removal and inhibition of lead leaching contained within the brass material of plumbing fixtures with an aqueous leaching solution for a sufficient time to remove lead contained therein, the aqueous leaching solution comprised of nitric acid having 20 to 35% by weight, one of several inhibitors selected from the group of block copolymers of polyethylene glycols, propylene oxide and ethylene oxide, fluorocarbon surfactant, and polyols having molecular weight between 100 and 8000, and iron-III chloride having concentration from 5 to 8 grams, the ambient temperature not exceeding 25 degrees Celsius, and the cauterizing time used not exceeding 2 minutes.
Dependencies are inferred from the claim text.