SYMPOSIA PAPER Published: 01 January 1990
STP25280S

IR Drop in Electrochemical Corrosion Studies— Part I: Basic Concepts and Estimates of Possible Measurement Errors

Source

Electrochemical techniques used in the study of corrosion are particularly susceptible to errors due to IR drop when used to study systems such as the corrosion of steel in natural waters. The influence of the electrochemical measurement cell geometry on both the nature and the magnitude of the expected errors is reviewed. Also, the effect of a non uniform current distribution on the working electrode is examined. Expected errors for a range of corrosion rates and water conductivities that are typical of steel in cooling systems are presented for three types of experiments. These experiments are: simple linear polarization (polarization resistance), small range polarization, which is computer-fit to extract the corrosion rate and Tafel parameters, and full polarization.

Author Information

Ehrhardt, WC
Betz Laboratories, Inc., Trevose, PA
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Details
Developed by Committee: G01
Pages: 27–58
DOI: 10.1520/STP25280S
ISBN-EB: 978-0-8031-5118-5
ISBN-13: 978-0-8031-1283-4