Journal of the Korean Electrochemical Society (전기화학회지)

The Korean Electrochemical Society (한국전기화학회)
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The Pitting Inhibition of Fe-Cu Alloy in Weakly Alkaline Solution under Wet-Dry Condition

  • Kim, Je-Kyoung (FCB R&D Group, Samsung Electro-Mechanics Co. Ltd.) ;
  • Kang, Tae-Young (Division of R & D Center, Unionsteel) ;
  • Moon, Kyung-Man (Department of Mechanical Materials Science and Engineering, Korea Maritime University)
  • Published : 2007.08.28
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Abstract

Pure iron, Fe-0.4, and 1.2 wt.%Cu alloys were examined by conducting the electrochemical techniques in the weakly alkaline solution, pH9, controlled by $Ca(OH)_2$, solution added with 0.02M NaCl. The $R_P$ measured from ac impedance, selected 10 kHz and 10mHz, in weakly alkaline solutions containing chloride ions indicated that the addition of copper up to 1.2wt.% into the pure iron significantly improved the pitting resistance of iron. In contrast to alloy, the pure iron showed the rapid pitting occurrences in drying period. During the drying period, the corrosion potential of pure iron was shifted to less noble value, pitting initiation.

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References

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