SEDL / STP / STP1277-EB / STP37953S

The Effects of Solution Resistance on Electrochemical Noise Resistance Measurements: A Theoretical Analysis

Cottis, RA
Senior lecturer, lecturer, and research student, Corrosion and Protection Centre, UMIST, Manchester,

Turgoose, S
Senior lecturer, lecturer, and research student, Corrosion and Protection Centre, UMIST, Manchester,

Mendoza-Flores, J
Senior lecturer, lecturer, and research student, Corrosion and Protection Centre, UMIST, Manchester,

Pages: 8    Published: Jan 1996

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Abstract

The theoretical basis of electrochemical noise resistance measurements in the presence of significant solution resistance is examined with a simple linear circuit model. A shot noise model of the noise generation process is assumed to develop the dependence of electrochemical potential and current noise on corrosion rate, although the conclusions in respect to electrochemical noise resistance do not depend on this. It is concluded that the electrochemical noise resistance method measures essentially the same resistance as is measured by a conventional linear polarization resistance measurement, although it is found to be capable of making measurements in higher resistance systems.