Impact of saline aquifer water on surface and shallow pit corrosion of martensitic stainless steels during exposure to CO2 environment (CCS)

8th International Conference on Future Environment and Energy

生态环境科学;能源学

Pfennig, Anja^1 ; Kranzmann, Axel^2

Dept. Mechanical Engineering, Applied Universtiy of Berlin HTW, Berlin, Germany^1

Federal Institute of Materials Research and Testing BAM, Berlin, Germany^2

关键词: Ambient pressures;    Capture and storage technologies;    Corrosion products;    Corrosive environment;    Martensitic microstructure;    Saline aquifers;    Surface corrosion;    Synthetic aquifers;   

Others  :  https://iopscience.iop.org/article/10.1088/1755-1315/150/1/012012/pdf
DOI  :  10.1088/1755-1315/150/1/012012

学科分类：环境科学（综合）

来源: IOP

【 摘 要 】

Pipe steels suitable for carbon capture and storage technology (CCS) require resistance against the corrosive environment of a potential CCS-site, e.g. heat, pressure, salinity of the aquifer, CO2-partial pressure. Samples of different mild and high alloyed stainless injection-pipe steels partially heat treated: 42CrMo4, X20Cr13, X46Cr13, X35CrMo4 as well as X5CrNiCuNb16-4 were kept at T=60°C and ambient pressure as well as p=100 bar for 700 h - 8000 h in a CO2-saturated synthetic aquifer environment similar to possible geological on-shore CCS-sites in the northern German Basin. Main corrosion products are FeCO3and FeOOH. Corrosion rates obtained at 100 bar are generally much lower than those measured at ambient pressure. Highest surface corrosion rates are 0.8 mm/year for 42CrMo4 and lowest 0.01 mm/year for X5CrNiCuNb16-4 in the vapour phase at ambient pressure. At 100 bar the highest corrosion rates are 0.01 mm/year for 42CrMo4, X20Cr13 (liquid phase), X46Cr13 and less than 0.01 mm/year for X35CrMo4 and X5CrNiCuNb16-4 after 8000 h of exposure with no regard to atmosphere. Martensitic microstructure offers good corrosion resistance.