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AC corrosion of structures under cathodic protection (CP) is a major concern for pipelines. This work investigates the effect of soil constituents - earth alkali elements Ca and Mg - believed to have a large influence on the precipitation of hydroxides and carbonates in front of a coating damage.
AC corrosion of cathodically protected structures is a major concern for pipelines in case of even minor AC perturbations. There are indications that the specific chemical environment has a large influence on the AC mitigation current density criteria outlined in EN 15280:2013. This work investigates the effect of soil constituents the earth alkali elements Ca and Mg traditionally believed to have a large influence on the formation of hydroxides and carbonates and the so-called ‘stone hard soil’-phase in front of a coating damage. Recent findings from excavations imply that the alkalization from cathode reactions can affect the stability of quartz sand SiO2 and induce the formation of iron containing neso-silicates hence also the influence of Si and Fe is investigated. Corrosion rate measurements in different environments and at different cathodic overpotentials is measured using ER-coupons and the chemistry and phase analysis is made using SEM/EDS ICP-OES and XRD.
Key words: AC corrosion, SEM, EDS, XRD, Cathodic protection, Calcareous deposits
An AC interference study was conducted in 2015 after the installation of a 240 kV powerline. Risk of AC corrosion was indicated. Describe are both the challenges and the solutions, including the design of a temporary mitigation system allowing energization of the powerline at reduced power.
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Challenges associated with coordinating the modelling, design, and installation of an alternating current interference and mitigation systems. The project consisted of a 65 kilometer long double circuit 500 kilovolt (kV) overhead transmission in a heavily congested right-of-way corridor with more than 80 pipelines.
Experiments to study the effects of AC interference on cathodic protection (CP). Changes of CP potential and current density under AC interference and AC corrosion rates obtained. Effective CP potential under AC interference analyzed. Interference compared.