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Evaluation of Alternating Current Corrosion on Coupons used for Monitoring Applications

Coated pipelines sharing a right-of-way corridor with electric transmission lines can be susceptible to corrosion. Corrosion on pipelines instigated from alternating current (AC) is driven by conductive and/or resistive coupling and can occur even when cathodically protected. AC corrosion coupon assemblies are used to monitor AC current density to assess the corrosion likelihood. This study investigated the sensitivity of AC corrosion coupons with respect to (i) coupon size and geometry (ii) installation location relative to pipeline and (iii) soil resistivity and chemical solution through three sets of laboratory testing conducted at ambient temperature and atmospheric conditions. In Experimental Set 1 three coupon sizes of 1 5 and 10 cm2 in the shapes of circle equilateral triangle rectangle and cylinder were tested the 5 cm2 circular coupon showed the highest sensitivity.In Experimental Set 2 the coupons were set at 10 20 30 and 40 cm from the coated pipeline in 4 separate sand cells. The coupon set at 20 cm had the highest measurement sensitivity and the coating exhibited blisters and corrosionpits after the application of AC and DC over 3 months. In Experimental Set 3 the solution chemistry was more sensitive than soil resistivity. Details will be presented in the paper.AcknowledgmentsThis work was sponsored by Enbridge Pipelines Inc.

Product Number: 51319-12839-SG
Author: Xihua He
Publication Date: 2019
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