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A Novel Corrosion Rate Monitoring Method For Steel In Soil Based On Tafel Extrapolation Method

Picture for A Novel Corrosion Rate Monitoring Method For Steel In Soil Based On Tafel Extrapolation Method
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Product Number: 51321-16967-SG
Author: Satoru Yamamoto; Masaru Abe; Kenkichi Tashiro
Publication Date: 2021
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It is important to monitor the corrosion rates of steel in electrolyte environments such as aqueous
solution as well as soil in order to evaluate the integrity of the members of facilities. As a nondestructive
monitoring method, CIPE (Current Interrupted Polarizing Extrapolation) method was developed. By the
CIPE method the corrosion rate is calculated by the Tafel equation obtained from the polarization curve
of in-situ measurement. It was found that the CIPE method was useful to monitor corrosion rates of
steel in concrete as well as in neutral aqueous solution as presented in the conferences of CORROSION 2018 and 2019. In this paper, results of corrosion rates of carbon steel in sand containing sea water, which were measured by the CIPE method were discussed. As a result, it was confirmed that the CIPE method was also useful to monitor corrosion rates of carbon steel in soil. Furthermore, it was considered that when dissolved oxygen decreased the corrosion rate became negligible and the test piece behaved as a reference electrode without corroding.

It is important to monitor the corrosion rates of steel in electrolyte environments such as aqueous
solution as well as soil in order to evaluate the integrity of the members of facilities. As a nondestructive
monitoring method, CIPE (Current Interrupted Polarizing Extrapolation) method was developed. By the
CIPE method the corrosion rate is calculated by the Tafel equation obtained from the polarization curve
of in-situ measurement. It was found that the CIPE method was useful to monitor corrosion rates of
steel in concrete as well as in neutral aqueous solution as presented in the conferences of CORROSION 2018 and 2019. In this paper, results of corrosion rates of carbon steel in sand containing sea water, which were measured by the CIPE method were discussed. As a result, it was confirmed that the CIPE method was also useful to monitor corrosion rates of carbon steel in soil. Furthermore, it was considered that when dissolved oxygen decreased the corrosion rate became negligible and the test piece behaved as a reference electrode without corroding.

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Picture for A Novel Corrosion Rate Monitoring Method for Steel in Neutral Aqueous Solution Based on Tafel Extrapolation Method
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A Novel Corrosion Rate Monitoring Method for Steel in Neutral Aqueous Solution Based on Tafel Extrapolation Method

Product Number: 51319-13254-SG
Author: Satoru Yamamoto
Publication Date: 2019
$20.00

It is important to monitor the corrosion rates of steel in electrolyte environments such as aqueous solution or soil in order to evaluate the integrity of the members of facilities. As the nondestructive monitoring method polarization resistance (Rp) method is generally known. The corrosion rate icor is calculated by the equation of icor=k/Rp . Herein k is a constant decided on the specific condition of steel surface and the environment. It is not easy to decide k on each condition. As a monitoring method without deciding k has been demanded CIPE (Current Interrupted Polarizing Extrapolation) method was developed. By CIPE method the corrosion rate is calculated by the Tafel equation obtained from the polarization curve of the in situ measurement.　In this paper in order to confirm accuracy of the method the measured corrosion rates were compared with the values calculated from mass losses of steel specimens in neutral aqueous solution. As a result the actual corrosion mass losses gave good agreement with the values of coulomb amounts which were calculated from the corrosion rates monitored by CIPE. Therefore it is clear that CIPE is a useful method for real time monitoring of corrosion rate of steel in aqueous solution.
Picture for 09521 Cathodic Protection in Cold Seawater – Current Density Requirement
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09521 Cathodic Protection in Cold Seawater – Current Density Requirement

Product Number: 51300-09521-SG
ISBN: 09521 2009 CP
Author: Roy Johnsen and Helga Wiik Stangeland
Publication Date: 2009
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Picture for 07120 Calculation of a Corrosion Rate Using Monte Carlo Simulation
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07120 Calculation of a Corrosion Rate Using Monte Carlo Simulation

Product Number: 51300-07120-SG
ISBN: 07120 2007 CP
Author: Kolin Kolovich and John F. Kiefner
Publication Date: 2007
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