Strategies for Corrosion Inhibition of Carbon Steel Pipelines Under Supercritical CO2/H2S Environments

The objective of the present study was to identify and quantify the key issues that affect the integrity of carbon steel in high-pressure CO2 and CO2/H2S environments and to establish potential corrosion mitigation strategies using low Cr alloy steels and corrosion inhibitors. The experiments were p...

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Bibliographic Details
Published in:Corrosion (Houston, Tex.) Tex.), 2019-10, Vol.75 (10), p.1156
Main Authors: Yoon-Seok, Choi, Hassani, Shokrollah, Thanh Nam Vu, Nešić, Srdjan, Abas, Ahmad Zaki B, Azmi Mohammed Nor, Suhor, Muhammad Firdaus
Format: Article
Language:English
Subjects:
Alloy steels
Alloys
Analytical methods
Autoclaving
Carbon dioxide
Carbon steel
Carbon steels
Chromium base alloys
Corrosion
Corrosion environments
Corrosion inhibitors
Corrosion potential
Corrosion prevention
Corrosion rate
Corrosion resistance
Corrosion resistant alloys
Corrosion resistant steels
Electrochemistry
Electrodes
Electrolytes
Enhanced oil recovery
Experiments
Gases
Hydrogen sulfide
Imidazoline
Inhibitors
Mitigation
Partial pressure
Pressure
Protection
Scanning electron microscopy
Steel
Steel pipes
Submarine pipelines
Sulfur
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Summary:The objective of the present study was to identify and quantify the key issues that affect the integrity of carbon steel in high-pressure CO2 and CO2/H2S environments and to establish potential corrosion mitigation strategies using low Cr alloy steels and corrosion inhibitors. The experiments were performed in a 7.5 L autoclave with two combinations of CO2 partial pressure and temperature (12 MPa/80°C and 8 MPa/25°C) with different H2S concentrations (0 ppm, 100 ppm, and 200 ppm). The corrosion behavior of specimens was evaluated using electrochemical measurements and surface analytical techniques. Results showed that the addition of corrosion inhibitor decreased corrosion rate significantly from 90 mm/y to below 0.1 mm/y at supercritical CO2 condition (12 MPa CO2, 80°C). However, insufficient protection was achieved from low Cr alloy steels. The addition of small amounts of H2S reduced the corrosion rate of carbon steel in high-pressure CO2 environments. However, the corrosion rate was still higher than the targeted rate (
ISSN:0010-9312
1938-159X
DOI:10.5006/2765