Effect of SO2 concentration as an impurity on carbon steel corrosion under subcritical CO2 environment

4th International Conference on Mechanical, Materials and Manufacturing

材料科学;机械制造

Mahlobo, M.G.R.^1 ; Premlall, K.^1 ; Olubambi, P.A.^2

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

关键词: CO2 corrosion;    Energy dispersive X ray spectroscopy;    Steel surface;    Subcritical CO2;    Subcritical state;    Supercritical;    Supercritical state;    Temperature profiles;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/272/1/012031/pdf
DOI  :  10.1088/1757-899X/272/1/012031

学科分类：材料科学（综合）

来源: IOP

【 摘 要 】

Carbon dioxide (CO2) is considered to be easier to transport over moderate distances when turned into supercritical state (dense phase) than at any other state. Because of this reason, the transportation of CO2during carbon capture and storage requires CO2to be at its supercritical state. CO2temperature profile from different regions causes CO2to deviate between supercritical and subcritical state (gas/liquid phase). In this study the influence of sulphur dioxide (SO2) on the corrosion of carbon steel was evaluated under different SO2 concentrations (0.5, 1.5 and 5%) in combination with subcritical CO2. Scanning Electron Microscopy (SEM), X-Ray Diffraction (XRD) and Energy-Dispersive X-ray Spectroscopy (EDS) were used to characterize the CO2corrosion product layer formed on the carbon steel surface. The weight loss results showed that corrosion rate increased with SO2concentration with corrosion rate up to 7.45 mm/year while at 0% SO2the corrosion rate was 0.067 mm/year.