Influence Of Heat Treatment On The Corrosion
Behavior Of Steels Exposed To CCS Environment
Author(s)
A. Pfennig, P. Wojtas, I. Spengler, B. Linke & A. Kranzmann
Abstract
The influence of heat treatment on 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). In laboratory experiments different heat treated
steels used as injection pipe with 13% Chromium and 0.46% Carbon (X46Cr13,
1.4034) as well as 0.2% Carbon (X20Cr13, 1.4021) were tested. Also
X5CrNiCuNb16-4 (1.4542) was investigated as typical steel used for geothermal
pumps. Keeping stable environmental conditions in laboratory experiments the
samples were exposed to the distinct synthetic aquifer environment saturated
with technical CO2 at a flow rate of 3 l/h for up to 6 months. Independent of the
exposure time the least amount of pits is found on hardened steels with
martensitic microstructure where X5CrNiCuNb16-4 shows fewer pits than
X46Cr13 and X20Cr13. Regarding steels with similar Cr-content the higher Ccontent
in 1.4034 results in fewer pits compared to 1.4021.
Keywords: steel, heat treatment, pit corrosion, CCS, CO2-injection, CO2-storage.
1 Introduction
Engineering a geological on-shore aquifer CCS-site (CCS Carbon Capture and
Storage [1–3]) corrosion of the casing and injection pipe steels may become an
issue when emission gasses, e.g. from combustion processes of power plants, are
compressed into deep geological layers [4–8]. From thermal energy production it
is known, that the CO2-corrosion is sensitively dependent on alloy composition,
contamination of alloy and media, environmental conditions like temperature,
Keywords
teel, heat treatment, pit corrosion, CCS, CO2-injection, CO2-storage
Related Book
Other papers in this volume
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