Corrosion Countermeasure for Building Equipment in Water Piping System

DOI

Bibliographic Information

Other Title
  • 建築設備用水配管システムの腐食対策
  • Part 2-Mechanistic Study on Non-Corrosivity of Anion Exchanged Waters on the Basis of Corrosion Indexes and Pourbaix Diagram
  • 第2報−腐食指数およびプルベダイアグラムに基づいたアニオン交換処理水の腐食抑制機構の推察

Abstract

<p>The authors are proceeding with a series of studies on corrosion countermeasures for building equipment in water piping systems. In the previous paper (Part1), the authors showed that treatment of tap water with anion exchange resin reduced corrosivity drastically. In practice, carbon steel did not corrode for 720h in the treated water. This paper (Part2) aimed to elucidate the mechanism of this reduction in corrosivity. First, the trajectory of corrosion potential vs. pH over time was discussed on the Pourbaix Diagram. The trajectory indicated that the passive film became tough in the treated water, while it collapsed in untreated water. The corrosion indexes supported this mechanism. Second, the change of water composition before and after the corrosion test was studied. The concentrations of Ca2+ and ionic SiO2, which were thought to be main constituents of the deposits, changed slightly. This indicated that no deposits was formed at the metal surface. From these results, the authors concluded that the key mechanism of corrosion prevention of the treated waters was the sustenance of passive film. </p>

Journal

Keywords

Details 詳細情報について

  • CRID
    1390296343171209344
  • DOI
    10.18948/shase.47.303_19
  • ISSN
    24240486
    0385275X
  • Text Lang
    ja
  • Data Source
    • JaLC
  • Abstract License Flag
    Disallowed

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