Journal of Electrochemical Science and Technology

The Korean Electrochemical Society (한국전기화학회)
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Potential Difference of Cyclic Polarization Curve of an Aircraft Al Alloy: ∆E (Esec,corr - Ecorr)

  • Sun, Qingqing (Department of Mechanical and Energy Engineering, Southern University of Science and Technology) ;
  • Chen, Kanghua (State Key Laboratory of Powder Metallurgy, Central South University)
  • Received : 2019.08.20
  • Accepted : 2019.12.03
  • Published : 2020.05.31
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Abstract

This paper presents a hypothesis and its experimental validation that ∆E (Esec,corr - Ecorr) of cyclic polarization curve of an Al-Zn-Mg-Cu alloy decreases firstly and then increases with the increasing of corrosion rate or corroded fraction Fcorr of alloy surface. The minimum value of ∆E is obtained when Fcorr ≈ 50%. In addition, a proportional relationship between ∆E and |50% - Fcorr| was found. This non-monotonic relation between ∆E and extent of localized corrosion indicates that additional attention should be paid on using ∆E to assess localized corrosion behaviour of Al-Zn-Mg-Cu alloys.

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References

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