Corrosion Science and Technology

The Corrosion Science Society of Korea (한국부식방식학회)
권호 표지

Influences of Coating Cycles and Composition on the Properties of Dimensionally Stable Anode for Cathodic Protection

  • Yoo, Y.R. (School of Advanced Materials Engineering, Andong National University) ;
  • Chang, H.Y. (Korea Power Engineering Company Inc.) ;
  • Take, S. (Oyama National College of Technology) ;
  • Kim, Y.S. (School of Advanced Materials Engineering, Andong National University)
  • Published : 2006.04.01
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Abstract

Properties of the anode for cathodic protection need low overvoltage for oxygen evolution and high corrosion resistance. It is well known that DSA (Dimensionally Stable Anode) has been the best anode ever since. DSA is mainly composed of $RuO_2$, $IrO_2$, $ZrO_2$, $Co_2O_3$, and also $Ta_2O_5$, $TiO_2$, $MnO_2$ are added to DSA for better corrosion resistance. The lifetime of DSA for cathodic protection is also one of the very important factors. $RuO_2$, $IrO_2$, $RhO_2$, $ZrO_2$ are well used for life extension, and many researches are focused on life extension by lowering oxygen evolution potential and minimizing dissolution of oxide coatings. This work aims to evaluate the influence of constituents of MMO and coating cycles and $ZrO_2$ coating on the electrochemical properties and lifetime of DSA electrodes. From the results of lifetime assessment in the anodes coated with single component, $RuO_2$ coating was more effective and showed longer lifetime than $IrO_2$ coating. Also, an increased coating cycle and an electrochemically coated $ZrO_2$ could enhance the lifetime of a DSA.

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References

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