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- W2915775812 abstract "Cathodic polarization (CP) is the common method for protection of gas pipelines from corrosion. Pipe-to-soil potential measurements have been conventionally used to monitor the level of corrosion protection. However, there are continuing incidents of corrosion related failures of nominally protected lines even for those which had routinely met the -0.85 V standard. An alternative method for monitoring the effectiveness of CP systems is measurement of local corrosion rates under CP. The method the authors are investigating is based on faradaic rectification. It exploits the non-linear current responses of a metal/electrolyte interface to an applied voltage. During the 1991-92 period, it was applied to measurements of steel corroding in sodium sulfate and sulfuric acid. Some of these results were verified by weight loss measurements. The corrosion rates for steel in sulfuric acid was found to be higher than in sodium sulfate independent of the level of cathodic polarization. The measured metal dissolution rates found using faradaic rectification were in order of magnitude agreement with weight loss experiments. The main goal for 1993 is to test the improved instrumentation under conditions which are representative of the field environment, and the rate will be measured under various concentrations of chloride and carbonate ions.more » In addition, they hope to extend the theory of faradaic rectification to cover partial mass transfer control.« less" @default.
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- W2915775812 date "1992-08-01" @default.
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- W2915775812 title "Fundamental advances for characterizing cathodic protection systems. Annual report, August 1991-July 1992" @default.
- W2915775812 hasPublicationYear "1992" @default.
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