Journal of Korean Society of Water and Wastewater (상하수도학회지)

The Korean Society of Water and Wastewater (대한상하수도학회)
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Effect and effective distance of rust and scale suppression by zinc device in piping

배관 내 아연 장치에 의한 녹과 스케일 억제 효과와 유효거리

  • Kyung-Taek Yum (Graduate School of Water Resources, Sungkyunkwan University) ;
  • Sang-Jin Woo (Technical division, Jinhaeng Waterway) ;
  • Sung-Bong Yang (Technical division, Jinhaeng Waterway) ;
  • Hak-Sup Shim (Technical division, Jinhaeng Waterway) ;
  • Mee-Seon Yu (School of Civil & Environment Engineering, University of Ulsan)
  • Received : 2023.02.21
  • Accepted : 2023.04.03
  • Published : 2023.04.15
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Abstract

The electrical connection between zinc metal and iron in contact with water prevents oxidation of iron until all zinc is dissolved, which is called a zinc sacrificial anode phenomenon. In the case of water pipes, zinc is often attached to the outside of the pipe, but examples of mounting zinc inside the pipe to prevent iron corrosion are not well known. Zinc devices sold for water pipes vary in the amount of zinc installed depending on the diameter of the pipe and the conditions of use, but the life of the product is generally expected to be 10-20 years until all zinc dissolves and disappears. Zinc ions dissolved from zinc to water in the pipe react with the calcium carbonate scale generated inside the pipe to consume zinc ions, and it was confirmed that the needle-shaped aragonite was converted into highly crystalline calcium after observing the scale crystal through an electron microscope. In addition, it is estimated that calcium ions of scale are replaced by zinc ions, gradually losing crystallinity, being deintercalated into the pipe, and oxygen in the water is consumed during the dissolution of zinc ions from zinc metals, turning red rust hematite (Fe2O3) into magnetite (Fe3O4). In addition, zinc ions were expected to move hundreds to thousands of meters depending on the diameter of the pipe in the new pipe, but it was confirmed that the travel distance was shortened in the case of pipes with many corrosion products.

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