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A comparison of zinc and nonzinc orthophosphate‐based corrosion control
American Water has orthophosphate‐based corrosion control programs at 78 treatment facilities, with zinc orthophosphate accounting for 88% of these programs. Many communities nationwide use zinc orthophosphate despite its expense and environmental concerns about zinc in wastewater sludge. The yearly use of zinc‐containing corrosion inhibitors in American Water systems accounts for more than 500,000 lb of zinc. Corrosion inhibitors that contain orthophosphate but offer an alternative to zinc orthophosphate include orthophosphoric acid and calcium or sodium orthophosphate salts. In this study, pilot‐testing of corrosion inhibitors with and without zinc was conducted using new metal coupons; results indicated that zinc does not play an important role in corrosion control. This testing indicates that a change from zinc orthophosphate to reduced concentrations of zinc in orthophosphate‐based corrosion inhibitors or orthophosphoric acid will not affect corrosion rates of lead or copper piping, will reduce the burden of removing excessive zinc from wastewater, and can reduce operational costs.
A comparison of zinc and nonzinc orthophosphate‐based corrosion control
American Water has orthophosphate‐based corrosion control programs at 78 treatment facilities, with zinc orthophosphate accounting for 88% of these programs. Many communities nationwide use zinc orthophosphate despite its expense and environmental concerns about zinc in wastewater sludge. The yearly use of zinc‐containing corrosion inhibitors in American Water systems accounts for more than 500,000 lb of zinc. Corrosion inhibitors that contain orthophosphate but offer an alternative to zinc orthophosphate include orthophosphoric acid and calcium or sodium orthophosphate salts. In this study, pilot‐testing of corrosion inhibitors with and without zinc was conducted using new metal coupons; results indicated that zinc does not play an important role in corrosion control. This testing indicates that a change from zinc orthophosphate to reduced concentrations of zinc in orthophosphate‐based corrosion inhibitors or orthophosphoric acid will not affect corrosion rates of lead or copper piping, will reduce the burden of removing excessive zinc from wastewater, and can reduce operational costs.
A comparison of zinc and nonzinc orthophosphate‐based corrosion control
Schneider, Orren D. (author) / Lechevallier, Mark W. (author) / Reed, Harold F. (author) / Corson, Matthew J. (author)
Journal ‐ American Water Works Association ; 99 ; 103-113
2007-11-01
11 pages
Article (Journal)
Electronic Resource
English
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