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Expanded Summary -- Effect of Zinc and Orthophosphate Corrosion Inhibitors on Cement-Based Pipes

  • Author(s): Parks, Jeffrey L.; Kashyap, Anusha; Atassi, Amrou; Schneider, Orren; Marc Edwards
  • Publications: Journal - American Water Works Association
  • Issue Date: January 2012
  • Volume / Number: 104, Number 1
  • Page(s): 37-37
  • DOI: http://dx.doi.org/10.5942/jawwa.2012.104.0001
  • Product Number: JAW_0076860
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Abstract

Many water utilities add zinc orthophosphate to treated water to reduce corrosion of plumbing materials within their distribution systems. The significance of zinc as a corrosion inhibitor was examined in bench-scale tests of concrete corrosion. In waters with low hardness and low alkalinity, zinc orthophosphate provided better corrosion inhibition for concrete or cement-based pipes than either zinc or orthophosphate alone. Addition of orthophosphate alone was beneficial in reducing the amount of scaling in waters with high hardness and high alkalinity.

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