Measure Corrosion by Electrochemical Impedance Spectroscopy — acquire, model and fit spectra for actionable insights

For researchers and practitioners who need to select frequency ranges, collect reliable spectra and extract parameters with equivalent-circuit fitting.

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Course Overview

You will be able to:

  • Select appropriate frequency ranges and amplitudes.
  • Acquire reliable impedance spectra.
  • Model corrosion processes with equivalent circuits.
  • Fit data to extract coating and corrosion parameters.

Curriculum

Basics of Corrosion & Impedance

  • What is EIS?
  • Understanding the corroding surface
  • Resistive response & Stern–Geary equation
  • Double‑layer capacitance
  • Electrolyte resistance
  • AC signals & impedance concept
  • Connecting impedances in series & parallel

Surface Processes & EIS Responses

  • Measuring the EIS spectrum
  • Effects of Rp, Rs & Cdl
  • Frequency‑range effects
  • Surface layers & coatings impact
  • Area effects on EIS spectra
  • Coating defects response

Practical Measurement Considerations

  • Measuring at corrosion potential
  • Signal amplitude influence
  • Measurement time vs frequency range
  • Charge passed during EIS
  • Stationarity & noise issues

Interpretation & Fitting

  • Equivalent circuit models
  • Fitting techniques & parameter extraction
  • Practical dataset example
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