Corrosion Science and Technology

The Corrosion Science Society of Korea (한국부식방식학회)
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Improvement of Corrosion Resistance for Copper Tube by Electrochemical Passivation

전기화학적 부동태화에 의한 동관의 내식성 개선 연구

  • Min, Sung-Ki (School of Materials Science and Engineering, Inha University) ;
  • Kim, Kyung-Tae (School of Materials Science and Engineering, Inha University) ;
  • Hwang, Woon-Suk (School of Materials Science and Engineering, Inha University)
  • 민성기 (인하대학교 신소재공학부) ;
  • 김경태 (인하대학교 신소재공학부) ;
  • 황운석 (인하대학교 신소재공학부)
  • Received : 2011.07.26
  • Accepted : 2011.08.26
  • Published : 2011.08.01
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Abstract

This study was performed to improve the corrosion resistance and the stability of passive film on copper tube by potentiostatic polarization method in synthetic tap water. Formation of passive film was carried out by anodic potentiostatic polarization at various passivation potentials and passivation times in 0.1 M NaOH solution. Stability of passive film and corrosion resistance was evaluated by self-activation time, ${\tau}_0$ from passive state to active state on open-circuit state in 0.1 M NaOH solution. Addition of polyphosphate in NaOH solution prolonged the self-activation time and improved the corrosion resistance, and the addition of 5 ppm polyphosphate was most effective. It was also observed that better corrosion resistance was obtained by potentiostatic polarization at 1.0 V (vs. SCE) than at any other passivation potentials. Passivated copper tube showed perfect corrosion resistance for the immersion test in synthetic tap water showing that the anodic potentiostatic polarization treatment in 0.1 M NaOH with 5 ppm polyphosphate solution would be effective in improving the corrosion resistance and preventing the blue water problem.

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