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In situ Electrochemical Evaluation of Pitting Corrosion of Carbon Steel Pipelines Exposed to Slightly Sour Seawater Service

The study of pitting susceptibility of carbon steel exposed to slightly sour service environment is conducted by using direct current and electrochemical impedance (IES). The test matrix is designed considering the oxidizing potential of the seawater as the independent variable.

 

Product Number: 51317--9416-SG
ISBN: 9416 2017 CP
Author: Ray Case
Publication Date: 2017
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Pitting corrosion susceptibility was studied in a slightly sour seawater transport piping system using electrochemical methods deployed in situ using a novel reference electrode system. The objective of the study is to identify the root cause and the evaluation of the mitigation strategies for the pitting attack observed on the pipeline network.To study the pitting susceptibility of the carbon steel in the slightly sour service environment is done by using direct current and electrochemical impedance (IES). The tests matrix for the study is designed considering the oxidizing potential of the seawater as the independent variable and the stable pitting likelihood as the dependent parameter to assess pitting susceptibility.The results show that the reduction of thiosulfate / bisulfite produced within the environment to sulfur are the main cause for the presence of pitting on the carbon steel; hence the pitting resistance is increased by controlling the oxidizing reduction potential (ORP) of the seawater stream.The use of chemical corrosion inhibition is found to decrease the pitting propagation rate in both the highly oxidizing and reducing types of slightly sour seawater service conditions.

 Key words: Pitting, Carbon Steel, pipeline corrosion, corrosion inhibitors, electrochemical methods

Pitting corrosion susceptibility was studied in a slightly sour seawater transport piping system using electrochemical methods deployed in situ using a novel reference electrode system. The objective of the study is to identify the root cause and the evaluation of the mitigation strategies for the pitting attack observed on the pipeline network.To study the pitting susceptibility of the carbon steel in the slightly sour service environment is done by using direct current and electrochemical impedance (IES). The tests matrix for the study is designed considering the oxidizing potential of the seawater as the independent variable and the stable pitting likelihood as the dependent parameter to assess pitting susceptibility.The results show that the reduction of thiosulfate / bisulfite produced within the environment to sulfur are the main cause for the presence of pitting on the carbon steel; hence the pitting resistance is increased by controlling the oxidizing reduction potential (ORP) of the seawater stream.The use of chemical corrosion inhibition is found to decrease the pitting propagation rate in both the highly oxidizing and reducing types of slightly sour seawater service conditions.

 Key words: Pitting, Carbon Steel, pipeline corrosion, corrosion inhibitors, electrochemical methods

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