Ant Nest Corrosion Developed on Copper Tubes Immersed in Copper Formate and Copper Acetate Solutions

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  • Sakai Masahiro
    College of Design and Manufacturing Technology, Muroran Institute of Technology
  • Takahashi Hironobu
    Division of Production System Engineering, Muroran Institute of Technology

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Other Title
  • ギ酸銅および酢酸銅溶液に浸漬した銅管に発生する蟻の巣状腐食
  • ギサン ドウ オヨビ サクサン ドウ ヨウエキ ニ シンシ シタ ドウカン ニ ハッセイ スル アリ ノ ソウジョウ フショク

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<p>Immersion tests for phosphorous deoxidized copper （PDC） and oxygen-free copper （OFC） tubes were conducted to investigate an ant nest corrosion developed in copper formate and copper acetate solutions. The test solutions with copper formate and copper acetate concentrations of 0.001, 0.01 and 0.1 mol/L were prepared. The copper tubes were taken out from the solutions at 28, 56 and 84 days for optical and scanning electron microscopy on the cross-sectional surface of the specimens. Typical ant nest corrosion with randomly-branched pits occurred in both PDC and OFC tubes immersed in 0.001, 0.01 and 0.1 mol/L copper formate solutions. On the other hand, hemispherical single pit developed in both PDC and OFC tubes immersed in only 0.1 mol/L copper acetate solution. SEM observation revealed that the corrosion pit area developed in both the copper formate and the copper acetate solutions were composed of metallic copper with fine sponge-like pores.</p>

Journal

  • Corrosion Engineering

    Corrosion Engineering 67 (6), 246-250, 2018-06-15

    Japan Society of Corrosion Engineering

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