Abstract: The present invention provides a method and apparatus for estimation of general and localized corrosion penetration rates of metallic materials and objects. The invention can also be used to discriminate between general and localized corrosion. A one, two or three electrode probe having electrodes (101, 102, 103) made of the same material as the material being monitored is located in the same corrosive environment as the material being monitored. An electrochemical harmonic analysis is performed and electrochemical noise signals are monitored, and the resulting responses are analyzed and compared to discriminate between general and localized corrosion attack and to determine a localized corrosion penetration rate. A law frequency sine wave is applied to the working electrode. Harmonic analysis of the electrode response provides information regarding the general corrosion rate and the stern-geary constant.

Abstract: The present invention provides a method and apparatus for estimation of general and localised corrosion penetration rates of metallic materials and objects. The invention can also be used to discriminate between general and localised corrosion. A one, two or three electrode probe having electrodes (101, 102, 103) made of the same material as the material being monitored is located in the same corrosive environment as the material being monitored. An electrochemical harmonic analysis is performed and electrochemical noise signals are monitored, and the resulting responses are analysed and compared to discriminate between general and localised corrosion attack and to determine a localised corrosion penetration rate. A law frequency sine wave is applied to the working electrode. Harmonic analysis of the electrode response provides information regarding the general corrosion rate and the stern-geary constant.

Abstract: A method and apparatus for the indentification of corrosion in a metal object is disclosed. The method comprises analyzing the statistical distribution of signals generated between two electrodes, typically exposed to the same corrosion conditions as the metal object, and preferably analyzes the skewness and kurtosis of the signals. Neural nets are preferably used in the analysis.