Effect of CO2 partial pressure and different CO2 phases on carbon steel corrosion

[摘要] Carbon capture and storage (CCS) is the recent promising technology aimed at reducing greenhouse gas emission. Like many other developed technologies, CCS is faced with great challenges such as pipeline transportation failure due to corrosion. There are many factors contributing to steel corrosion during the pipeline transportation of carbon dioxide (CO2). This study focuses on CO2partial pressure and different phases of CO2as some of the factors contributing to steel corrosion. Carbon steel was used as a testing specimen. High pressure reactor was used in this study to compress CO2from low to high pressures ultimately changing the CO2from gaseous phase to gas/liquid phase (subcritical) and to dense phase (supercritical). Weight loss method was employed to determine the corrosion rate while scanning electron microscopy (SEM) and X-Ray diffraction (XRD) were used to study the carbon steel morphology and phase analysis. Using low magnification digital camera, the type of corrosion that took place on the carbon steel surface was identified.

[发布机构] Chemical, Metallurgical and Materials Engineering Department, Tshwane University of Technology, Pretoria; 0001, South Africa^1;Chemical Engineering Department, University of Johannesburg, Johannesburg; 2000, South Africa^2

[效力级别] 机械制造 [学科分类] 材料科学（综合）

[关键词] Carbon capture and storages (CCS);Gaseous phase;High pressure reactors;Phase analysis;Pipe-line transportations;Steel surface;Supercritical;Weight loss method