The Effect of Components Dissolved in Tap Water on Copper-corrosion Rate

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  • 銅の腐食速度に及ぼす上水中の溶解成分の影響
  • ドウ ノ フショク ソクド ニ オヨボス ジョウスイチュウ ノ ヨウカイ セイブン ノ エイキョウ

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Abstract

Copper tube is generally used in water supplying systems, however the copper tube rarely suffers from a type I pitting-corrosion. To begin with, the effect of components dissolved in tap water on copper-corrosion rate was investigated in this paper.<br>Copper specimens were immersed in 20 samples of tap water. After 48 hours immersion tests, electrochemical impedance spectroscopy (EIS) measurements were carried out. The copper-corrosion rate was estimated by the result of the EIS measurement. A relationship between the copper-corrosion rate and components dissolved in the tap water was calculated from a multiple regression analysis. This analysis shows that the copper corrosion-rate increases with concentration of a free carbon dioxide.<br>Polarization curves of the copper specimens were also measured in the tap water samples. Cathodic polarization curves in 20 waters have various profiles in the range of 0 to -0.4V vs. SSE. The slope (ΔV/mV decade-1) of the cathodic polarization curve at -0.25V vs. SSE decreased as the copper corrosion-rate decreased. The profile of the cathodic polarization curve might depend on a state of the oxide film on the surface of copper. It is considered that protective oxide film prevents reduction of dissolved oxygen and that copper corrosion-rate decreases with inhibition of the reduction reaction.

Journal

  • Zairyo-to-Kankyo

    Zairyo-to-Kankyo 51 (6), 240-249, 2002

    Japan Society of Corrosion Engineering

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