Title

Coating Studies of Buried Pipe in Soil by Novel Approach of Electrochemical Impedance Spectroscopy at Wide Frequency Domain

Document Type

Article

Publication Date

Spring 5-2015

Abstract

The coating performance of buried pipe in clayey soil has been studied by electrochemical impedance spectroscopy (EIS). The results of EIS at 300 days have been analysed by electric equivalent circuit (EEC) models. The new parameters ensemble average phase (EAP) and ensemble average impedance (EAI) were introduced, obtained directly from Bode plots at a wide frequency domain in EIS data. These two parameters proved to be effective and convenient when evaluating the performance evolution of the coatings used in buried pipe in clayey soil, for both intact and defective coatings. The results indicated that the EAI parameter has a good agreement with the fitting results by EEC models and that the changes in EAP over time illustrated the three damage evolution stages of coated pipe in soil. It is concluded that EAP and EAI can be used for fast evaluation of coatings used in practical buried pipeline in soil.

Publication Title

Corrosion Engineering, Science and Technology

Volume

50

Issue

3

First Page

218

Last Page

225

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