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09119 An Electrochemical Impedance Spectroscopy (EIS) Based Above-ground Technique for Determining Coating Condition

Picture for 09119 An Electrochemical Impedance Spectroscopy (EIS) Based Above-ground Technique for Determining
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Product Number: 51300-09119-SG
ISBN: 09119 2009 CP
Author: Fraser King, Russ Given, Li Yan, Robert Grant Worthingham
Publication Date: 2009
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In this study, the Electrochemical Impedance Spectroscopy (EIS) technique was used to identify damage to asphalt coating on carbon steel pipelines in a soil box filled with water-saturated sand. Four pipe segments with different asphalt coating conditions, i.e., good asphalt coating with two difference sizes of holiday and no holiday, and degraded coating, were used. Significant differences were observed from the EIS data monitored on these four segments. For the segments covered with the good asphalt coating, the impedances measured from the segments with a holiday were consistently smaller than those obtained from the segment without a holiday, and the larger the holiday, the smaller the impedance was. Degraded coating showed very low impedances because of the high porosity and large cracks in the coating. The value of the sand resistance, Rsand, derived from the EIS data showed a dependence on the relative location of the holiday, which indicated that the EIS-based above-ground technique might be able to identify the location of the holiday.

KEY WORDS: EIS measurement, above ground technique, sand, cathodic protection, asphalt coating, holiday, degraded asphalt coating, coating condition
In this study, the Electrochemical Impedance Spectroscopy (EIS) technique was used to identify damage to asphalt coating on carbon steel pipelines in a soil box filled with water-saturated sand. Four pipe segments with different asphalt coating conditions, i.e., good asphalt coating with two difference sizes of holiday and no holiday, and degraded coating, were used. Significant differences were observed from the EIS data monitored on these four segments. For the segments covered with the good asphalt coating, the impedances measured from the segments with a holiday were consistently smaller than those obtained from the segment without a holiday, and the larger the holiday, the smaller the impedance was. Degraded coating showed very low impedances because of the high porosity and large cracks in the coating. The value of the sand resistance, Rsand, derived from the EIS data showed a dependence on the relative location of the holiday, which indicated that the EIS-based above-ground technique might be able to identify the location of the holiday.

KEY WORDS: EIS measurement, above ground technique, sand, cathodic protection, asphalt coating, holiday, degraded asphalt coating, coating condition
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