A corrosion monitoring system using electrochemical noise measurements and their numerical analysis was developed. Electrochemical noise was measured in a freely corroding system containing three identical metal electrodes. A voltage signal generated by the first pair of electrodes and a current signal generated by the second pair were measured, and the data were fed into a computer. A mathematical model that included signal processing and pattern recognition was implemented using computer software. Analysis of the electrochemical noise enabled determination of the corrosion rate and the corrosion type. The reliability of the corrosion monitoring system was tested against various reference methods (visual inspection, scanning electron microscopy, current-vs-potential curves, and electrical resistance). Tests were performed on steel and aluminum in aqueous solutions of various pH and conductivity values.

Subject
Voltage, Noise measurements, Corrosion currents, Corrosion rate, Electrochemical noise, Aluminum, Sodium chloride, Current noise, Electrochemical current, Metals, Electrodes, Types of corrosion, Uniform corrosion
Keywords:
corrosion monitoring, corrosion rate, current, electrochemical noise, localized corrosion, power-density spectrum, uniform corrosion
NACE International
1995
You do not currently have access to this content.