Electrochemical Measurements of Corrosion and Biofouling Films on Simulated OTEC Heat Exchangers

  • P. K. Sullivan
  • B. E. Liebert


Electrochemical measurements of corrosion and biofouling films have been performed using a recently developed technique called Electrode Impedance Spectroscopy (EIS). EIS is based on the hypothesis that corrosion and biofouling films can be characterized by observing the steady-state response to a small amplitude sinusoidal perturbing potential imposed on the heat exchanger material.

Copper-nickel, aluminum, and titanium alloys were evaluated with specially designed EIS corrosion cells placed in flowing seawater. Results were compared with the weight loss of coupons in line with the corrosion cells.

The results from these tests indicated that instantaneous corrosion rates can be determined at low frequencies, changes resulting from biofouling occur at high frequencies, the occur- ance of localized corrosion and multiple fouling films can be identified, and the effect of cleaning the surface of the material can be readily determined.


Heat Exchanger Corrosion Rate Bide Plot Flowing Seawater Ocean Thermal Energy Conversion 
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Copyright information

© Springer-Verlag Tokyo 1985

Authors and Affiliations

  • P. K. Sullivan
    • 1
  • B. E. Liebert
    • 2
  1. 1.Departments of Ocean EngineeringUniversity of HawaiiHonoluluUSA
  2. 2.Departments of Mechanical EngineeringUniversity of HawaiiHonoluluUSA

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