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11343 Study of AC Corrosion on Coated Pipeline Steel in Simulated Soil Solution

Picture for 11343 Study of AC Corrosion on Coated Pipeline Steel in Simulated Soil Solution
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Product Number: 51300-11343-SG
ISBN: 2011 11343 CP
Author: Xin Xu, Lining Xu, Wei Liu, Minxu Lu
Publication Date: 2011
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$20.00
$20.00
Buried pipelines paralleling or crossing high voltage power line systems are often subjected to induced AC interference, which may cause serious corrosion risk. There have been many conclusions including size of coating defects, AC current density, etc. to estimate corrosion condition, but no industry standard evaluation criterion has been established. In this paper, the AC induced corrosion of coated pipeline was studied with coated specimens in simulated soil solution under various experimental conditions to determine the AC corrosion risk considering the cathodic protection, coating defects, AC current density, soil acidity/alkalinity, and the soil resistivity. It has been identified that failures in oil and gas transmission pipelines by destructive pitting may be caused by AC interference. Pitting corrosion was also studied in this paper by electrochemical measurements and AC corrosion mechanism was further analyzed. Specific morphology of characteristics of AC corrosion was observed by Scanning Electron Microscope (SEM) technical.

Keyword: AC interference, coating defects, evaluation criterion, pitting corrosion
Buried pipelines paralleling or crossing high voltage power line systems are often subjected to induced AC interference, which may cause serious corrosion risk. There have been many conclusions including size of coating defects, AC current density, etc. to estimate corrosion condition, but no industry standard evaluation criterion has been established. In this paper, the AC induced corrosion of coated pipeline was studied with coated specimens in simulated soil solution under various experimental conditions to determine the AC corrosion risk considering the cathodic protection, coating defects, AC current density, soil acidity/alkalinity, and the soil resistivity. It has been identified that failures in oil and gas transmission pipelines by destructive pitting may be caused by AC interference. Pitting corrosion was also studied in this paper by electrochemical measurements and AC corrosion mechanism was further analyzed. Specific morphology of characteristics of AC corrosion was observed by Scanning Electron Microscope (SEM) technical.

Keyword: AC interference, coating defects, evaluation criterion, pitting corrosion
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