This paper presents an evaluation of the thin film corrosion sensors that could be used in combination with a mobile, wireless platform to detect internal corrosion along a pipeline. The iron-copper, thin film interdigitated sensor was found to be appropriate for detecting the presence of corrosive conditions within the pipe. The sensor reading using DC resistance measurement method reflected the corrosivity of a number of electrolytes and was able to determine the corrosion rate of iron in these environments. The sensor readings were reproducible. The sensor was able to distinguish between bulk aqueous solution and condensed moisture film. The sensor response was relatively rapid (within 60 s), thus permitting it to be used as a transient, retrievable sensor. The sensor life in the presence of acid gases, CO2 and H2S, was relatively short (less than a week). The sensor readings were only slightly dependent on sensor geometry.

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