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Journal of Failure Analysis and Prevention

, Volume 11, Issue 2, pp 152–157 | Cite as

Analysis of Copper Pitting Failure in Drinking Water Distribution System

  • Zhijun Jia
  • Cuiwei Du
  • Dongdong Zhang
  • Xiaogang Li
Technical Article---Peer-Reviewed

Abstract

Electrochemical tests, as well as surface and chemical analysis were used to investigate the cause of pitting failure of copper tubing in a drinking water distribution system. The results show that localized pitting was the cause of failure and copper corrosion problems were observed under a green deposit. The pitting corrosion was associated with the Cl and SO4 2− ions introduced by the water softening treatment. These ions promoted the corrosion and the influence of Cl ion was much greater than that of the SO4 2− ion.

Keywords

Pitting Corrosion failure analysis Current testing Copper tube Water distribution system Electrochemical test 

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Copyright information

© ASM International 2010

Authors and Affiliations

  • Zhijun Jia
    • 1
  • Cuiwei Du
    • 1
  • Dongdong Zhang
    • 1
  • Xiaogang Li
    • 1
  1. 1.Center of Corrosion and ProtectionUniversity of Science and Technology BeijingBeijingChina

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