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Abstract

A novel combination microelectrode was constructed based on an iridium pH microelectrode and an Ag/AgCl microelectrode, and was applied to simultaneously monitor the steel potential, pH and chloride ion concentration in a crevice simulating disbonding of pipeline coatings with cathodic protection (CP) applied or removed. The sensing characteristics and sensitivity of the microelectrode are described as well as the calibration procedures. A simulated crevice was formed between a pipeline steel surface and a polymethylmethacrylate plate. The results showed that in CP conditions, the evident potential gradient resulting from the IR potential drop was concentrated at the crevice opening. A protective local environment induced by CP under disbonded coatings was characterised by an increase in pH and removal of Cl⁻. After CP is removed, the protective effects can persist for a period of time, depending on the diffusion of soluble species.

Keywords

CATHODIC PROTECTION CREVICE CORROSION MICROELECTRODE POLARISATION POTENTIAL DISTRIBUTION STRESS CORROSION CRACKING

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Electrochemical measurements using combination microelectrode in crevice simulating disbonded of pipeline coatings under cathodic protection

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