Monitoring corrosion rates with ER-probes – a critical assessment based on experiments and numerical modelling

Abstract

Electrical resistance (ER) probes are a technique used to monitor the corrosion rate (CR) of metals in a wide range of applications and industries. However, limited data comparing CR measured with ERprobes, weight loss and electrochemical methods is available. The aim of this work is to provide data regarding the reliability of CR measurements with ER-probes by comparison with LPR, EIS and weight loss measurements and to provide suggestions for designing ER-probes depending on the expected corrosion mechanism and CR. To evaluate the ER-probes reliability in CR measurements, both uniform and localised corrosion in four different environments were studied. CRs obtained with ER-probes showed good agreement with weight loss and electrochemical measurements. Numerical models were used to optimise ER-probe geometry regarding the expected corrosion type and CR, and to study the effect of Joule heating. Design charts were proposed to support ERprobes design concerning the expected CR in certain applications.

An Online Monitoring Approach of Carbon Steel Corrosion via the Use of Electrochemical Noise and Wavelet Analysis

“…One of the promising methods for corrosion studies and field monitoring is electrochemical noise (EN) measurement besides the other conventional corrosion methods, e.g., electrochemical impedance spectroscopy (EIS), linear polarization method (LPR) and electrical resistance (ER) [4][5][6]. Specifically, EN is widely used because of its ease of use.…”