WIT Press

The Role Of Pit Corrosion In Engineering The Carbon Storage Site At Ketzin, Germany


Free (open access)

Paper DOI






Page Range

109 - 119




2,240 kb


A. Pfennig & A. Kranzmann


The role of pit corrosion needs to be considered to guarantee reliability and safety during the injection of compressed emission gasses – mainly containing CO2 – into deep geological layers (CCS-technology, Carbon Capture and Storage). Therefore, laboratory experiments were carried out under the distinct synthetic aquifer environment saturated with technical CO2 at a flow rate of 2 l/h found at the CCS-site at Ketzin, Germany. To determine the local corrosion behaviour, different pipe steels with 1% Cr 0.42% C (42CrMo4) and 13% Cr 0.46% C (X46Cr13) were compared. The samples were heat treated for up to 2 years and the reaction kinetics were determined. Pits were formed exclusively on the high chromium bearing steels. Pit heights and diameters were measured and a precipitation model was derived from the phases found within the complicated multilayer corrosion phases, such as siderite FeCO3 and goethite - FeOOH. Manganese and chromium carbides were found to be possible initial causes for the ongoing pit corrosion. Keywords: steel, pipeline, pit corrosion, CCS, CO2-injection, CO2-storage. 1 Introduction When engineering the geological CCS-site at Ketzin, Germany (CO2-SINK, CCS Carbon Capture and Storage [1, 2]), corrosion of the casing and injection pipe steels may become an issue when emission gasses are compressed from combustion processes into deep geological layers [3-10]. It is known from thermal energy production that the CO2-corrosion is sensitively dependent on alloy composition, the contamination of alloy and media, environmental conditions such as temperature, CO2 partial pressure, flow conditions and


steel, pipeline, pit corrosion, CCS, CO2-injection, CO2-storage