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Use Of Potential Probes To Monitor Cathodic Protection: Accuracy Of The IR-Free Potential Measurement

Cathodic protection (CP) is an electrochemical corrosion prevention technique, which is implemented by circulating a direct current between an electrode (anode) placed in the environment and the structure to be protected (the cathode): this current causes a lowering of the potential of the metal and reduces its corrosion rate, until it stops. 

Product Number: 51321-16765-SG
Author: Silvia Beretta, Marco Ormellese, Andrea Brenna
Publication Date: 2021
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Potential probes are sensors consisting of a reference electrode and a metal coupon close to the electrode used for measuring the protection potential of underground metal structures in cathodic protection. They allow the reading of the potential purified by the ohmic drop contribution, the so-called IR-free potential, a useful parameter for assessing the effectiveness of a cathodic protection system. Aim of this work is to compare the accuracy of the potential measurements of commercial probes, which differ in geometry, extension of the porous plug, number and position of the metal coupons. Measurements of reference electrode potential stability in the presence of cathodic protection and ability of the probes to compensate the ohmic drop were performed. The results showed that not all potential probes are able to measure the IR-free potential, as the measurement contains an ohmic drop contribution, greater for more negative cathodic polarization values.



Potential probes are sensors consisting of a reference electrode and a metal coupon close to the electrode used for measuring the protection potential of underground metal structures in cathodic protection. They allow the reading of the potential purified by the ohmic drop contribution, the so-called IR-free potential, a useful parameter for assessing the effectiveness of a cathodic protection system. Aim of this work is to compare the accuracy of the potential measurements of commercial probes, which differ in geometry, extension of the porous plug, number and position of the metal coupons. Measurements of reference electrode potential stability in the presence of cathodic protection and ability of the probes to compensate the ohmic drop were performed. The results showed that not all potential probes are able to measure the IR-free potential, as the measurement contains an ohmic drop contribution, greater for more negative cathodic polarization values.



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