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Development of an Electrochemical Method to Study Top-Of-The-Line Corrosion

Picture for Development of an Electrochemical Method to Study Top-Of-The-Line Corrosion
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A top-of-the-line monitoring cell has been developed, that measures in-situ corrosion rates by electrochemical methods. The data presented in this paper have been conducted over 5 days at variable condensation rates to evaluate the feasibility and accuracy of the methods applied.

Product Number: 51317--9106-SG
ISBN: 9106 2017 CP
Author: Md Mayeedul Islam
Publication Date: 2017
Industry: Pipelines, Tanks, and Underground Systems
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Top-of-the-line corrosion (TLC) is a concern for subsea wet-gas transportation pipelines operated in a stratified flow regime. Water vapour condensing at the top of the pipeline is corrosive due to the dissolution of the acid gases (CO2 H2S) present in the fluid.The insufficient volume of electrolyte at the top-of-the-line (condensation) combined with the low electrical conductivity of the condensed liquid has confined to-date TLC studies to the weight loss method which “only” provides averaged over a long period of time information. The onset of localised corrosion cannot be exactly determined which makes it difficult to determine localised corrosion rates and mechanistic data. The instantaneous monitoring of TLC rates using electrochemical methods is still a challenge for researchers and in the field.To overcome this limitation a novel TLC monitoring cell has been developed which is capable of measuringin-situ corrosion rates by electrochemical methods such as Linear Polarization Resistance (LPR) Electrochemical Impedance Spectroscopy (EIS) and Electrochemical Frequency Modulation (EFM). The data presented in this paper have been conducted over 5 days at variable condensation rates to evaluate the feasibility and accuracy of the methods applied. In addition TLC rates have also been monitoredin-situ by measuring the iron concentration in the condensed liquids in order to compare these results with electrochemical methods. Thus this paper presents the comparability and limitations of different electrochemical techniques applied to TLC studies. 

Key words: top-of-the-line corrosion, electrochemical method, weight loss, electrochemical frequency modulation

Top-of-the-line corrosion (TLC) is a concern for subsea wet-gas transportation pipelines operated in a stratified flow regime. Water vapour condensing at the top of the pipeline is corrosive due to the dissolution of the acid gases (CO2 H2S) present in the fluid.The insufficient volume of electrolyte at the top-of-the-line (condensation) combined with the low electrical conductivity of the condensed liquid has confined to-date TLC studies to the weight loss method which “only” provides averaged over a long period of time information. The onset of localised corrosion cannot be exactly determined which makes it difficult to determine localised corrosion rates and mechanistic data. The instantaneous monitoring of TLC rates using electrochemical methods is still a challenge for researchers and in the field.To overcome this limitation a novel TLC monitoring cell has been developed which is capable of measuringin-situ corrosion rates by electrochemical methods such as Linear Polarization Resistance (LPR) Electrochemical Impedance Spectroscopy (EIS) and Electrochemical Frequency Modulation (EFM). The data presented in this paper have been conducted over 5 days at variable condensation rates to evaluate the feasibility and accuracy of the methods applied. In addition TLC rates have also been monitoredin-situ by measuring the iron concentration in the condensed liquids in order to compare these results with electrochemical methods. Thus this paper presents the comparability and limitations of different electrochemical techniques applied to TLC studies. 

Key words: top-of-the-line corrosion, electrochemical method, weight loss, electrochemical frequency modulation

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